Tag: golden state killer

Criminal JusticeEvidenceExpert Witness

Golden State Killer, Part 3: Defense Concerns about Tainted Memories

“Few rights are more important than a right to a fair trial.” According to this article, in The Mercury News, these words were spoken in court last week by attorney David Lynch, defense counsel for James Joseph DeAngelo, the alleged Golden State Killer. Mr Lynch is right. His words are of the utmost importance. So important, in fact, we spend significant time in law school learning criminal justice and rights of the accused. As I recall, there were at least two courses dedicated to the subject entirely: Criminal Law and Criminal Procedure. Other courses are substantially related to the topic, i.e., Evidence and Constitutional Law.

Even for the worst criminals accused of the most heinous crimes, we have to offer a fair trial. It should remain a priority for a civil society. I, for one, would rather a guilty person go free than an innocent person be imprisoned. I feel the readers pulling away from me at this point. You may be asking, “How can you say that about the Golden State Killer? Have you read about his crimes?” Yes, I have, and I understand the emotions tied to convicting him. In fact, if Mr. DeAngelo has committed the crimes he’s accused of, I want him convicted. However, I want him to have a fair trial and I expect the prosecution to prove their case. That’s the law and it should be followed. If proper procedures are followed, it also avoids the case being overturned on appeal.

For our purposes, David Lynch provided an even more interesting statement in court last week. Mr. Lynch said, “When you have an old memory, it can be tainted if you get new information.” The Mercury News elaborated on his concern:

“Lynch estimated 16,000 articles were written about the Golden State Killer online, including more than 100 by the local Sacramento newspaper within two weeks of DeAngelo’s arrest. He said releasing information could affect witnesses’ memories and hurt the jury selection process.”

Based on my experience working with expert witnesses, I know there are immense concerns about matters such as eyewitness identification and witness memory. I mention the two together because memory can impact identification.

In the Golden State Killer matter, we have no publicly available information of an eyewitness identification (no reporting about photo identification or line-ups). Nevertheless, we do have many eyewitnesses to the crimes (including over 40 rape victims). As such, Mr. Lynch is probably concerned about other memories associated with the crimes. Such as physical attributes, physical description, verbal interactions, time of day, weather, residential layout, and more. Defense counsel doesn’t want new information released to the potential jury pool, victims, and other witnesses that might create false memories about which they may later testify.

Allyson Kacmarski – Criminal Defense Lawyer – Wilkes Barre, PA

To help our readers understand the concerns of David Lynch, I thought it was important to get some further input on memory concerns from a practicing defense attorney, so I reached out to a friend who practices criminal defense in Pennsylvania.

Allyson L. Kacmarski is a former public defender and former Assistant District Attorney who is now in private practice in Wilkes Barre, PA. Her firm is a full-service criminal defense and family law office serving clients in Wilkes-Barre, Luzerne County, and throughout northeastern Pennsylvania. Allyson does some spectacular work connecting and educating clients via her Instagram account. You can learn more about her practice by visiting attorneyallyson.com.

I posed some questions to Allyson and she provided some very detailed answers regarding her concerns about witness memories.

Nick: From a criminal defense perspective, what concerns would you have about information impacting witness memories?

Ms. Kacmarski: I like to believe that a witness’ memory is best right after the crime occurs. Think about this in your own life. When you tell a friend a story, the story has more details when you share this story within hours or days of the incident occurring, rather than months or years. Allowing an alleged victim or witness to read newspaper articles or portions of police reports can definitely impact the way a person recalls the incident. It’s always a cause for concern when a witness testifies at trial to details that were not contained in the original statement to the police. The question becomes, where did the witness get this “new” information from? Was it the newspaper? Maybe it was during witness prep with the police who are now providing information to the witness by asking questions that this witness did not know the answer to originally. Most people want to help the police and “catch the killer,” so there is definitely an innate pressure to agree with the police when they asked leading questions such as, “isn’t this the gun that the suspect had?” A person may say, “Oh, yes” even if he/she doesn’t remember because he/she doesn’t want to make the police mad or blow the case and let the killer go free. When you hear something enough, anyone can start to believe it is real and true, even if it’s not.

Nick: Does the defense attorney for the Golden State Killer have a valid concern about “tainted” memories?

Ms. Kacmarski: Yes, but this concern applies to any criminal case, not just the Golden State Killer. The pressure is always on in any case for a witness to testify successfully to facts that will show the Defendant is guilty of the crime as charged. For example, in criminal cases involving the testimony of a child, the court may have a taint hearing to determine if the child’s memory has been compromised by outside influences, such as a parent flat-out telling the child what to say or maybe it’s bad questioning or suggestive questioning by an interviewer that affects the child’s memory. The point is, whether it’s reading details in a newspaper article, talking to the police about the case during an interview, or even a witness discussing the incident with family or friends, taint could always occur. Providing a witness with information and details that he/she did not initially disclose to the police, can always lead to a defense attorney questioning how accurate the witness’ memory truly is.

Nick: In your experience, are witness memories reliable?

Ms. Kacmarski: Maybe yes… Maybe no. For me, reliability can be influenced by outside factors. For example, a witness may distinctly remember all the details of an event because it was unique or odd or something stood out that he/she would never forget. Maybe it’s something about the way a person spoke, or looked, or acted or dressed that made the incident not only memorable, but ingrained in the witness’ brain. I also think the length of time a witness interacts with a person can affect the memory. If the interaction is short, say seconds or minutes, how many details will a witness be able to recall when he/she has very little time to observe the other person. Speaking of interaction, things like a gun being present and used during an incident can greatly impact the reliability of a witness’ memory. Often times, the witness is so focused on the gun, he/she may not remember anything else about the incident.

Nick: With no current reports of eyewitness identification, what types of memories might defense counsel be concerned about tainting? (i.e. times, dates, physical attributes of the suspect, weather, physical layouts of a residence).

Ms. Kacmarski: My biggest concern as to taint would be the physical appearance of the suspect. Without someone describing the height/weight, skin color and complexion, even hair color, the identity of the suspect is unknown. In the Golden State Killer, the news has reported it was the DNA that led to the arrest. Once he was arrested, the Golden State Killer has been all over the news. It is very easy for a witness to see this guy in the news and say, “yes, that is him, I remember that face.” If the original statement fails to detail the suspect’s face or some outstanding facial characteristic, the concern is now the news has tainted the identification of this witness.

Nick: With a case of this magnitude (crimes across the state) would you be worried about the heavy press coverage impacting witness memories?

Ms. Kacmarski: Heavy press coverage can always impact a case. First, let me just say this, and no offense to the news community. But what you read in the newspaper is not always what really took place. I can say from my own personal experience because I have read articles “quoting” statements I made during a trial and guess what … I didn’t say it or it was taken completely out of context. The point is, when people read something in the newspaper he/she thinks it is 100% true. Since we can’t stop a witness from reading the newspaper, or should I say searching the internet, we can’t control how reading a statement from the police, containing information from various witnesses all combined, as well as details about evidence collected can cause the memory of a witness to “change.” And let’s just say, seeing the picture of a person in handcuffs, in prison garb, being escorted by the police, can do a lot to a person’s memory as to who he/she believes the “killer” is. Seeing a person’s face and image enough times, when he/she is in police custody, can taint the person’s memory as to physical appearance and details, especially if this takes place prior to the police showing the witness a photo line-up.

Nick: Can you provide any examples from your own practice about faulty witness memories?

Ms. Kacmarski: Examples of faulty witness memories:

  • In an attempted homicide case, a victim, who was shot in the back of the head, testified that he/she remembered what the gun looked like and then he/she described the gun to the jury. I asked the victim, “How do you know what the gun looked like, if you were lying face down on the ground?” The victim said, “Because the police told me about the gun.” I immediately asked “what?” The victim said “he/she couldn’t remember details of the incident, specifically the gun, so he/she asked the police and the police told him/her.”
  • Right after a crime happened, the police arrive and within approximately 2 hours of the crime occurring, the police interview a witness who says, “I saw a man walking down the street with a tan coat and a gun.” Approximately 11 months later, after TV and newspaper articles, the witness tells the police when he/she is served with a subpoena for trial, “Oh yeah, that guy I saw, he is my neighbor and we have talked before this.” Fast-forward to trial, the witness says, his/her next door neighbor told him/her that “the guy lives across the street” and by the way, there was no talking, just a “Hi.”

Nick: Is there any other information you would like to provide about witness memories in regards to criminal defense matters?

Ms. Kacmarski: When looking at a witness’s memory of an incident, I like to look at all the surrounding factors that can impact the memory.  In my opinion, things like the lighting, the time of day, was there a weapon involved, was the person under the influence of drugs and/or alcohol at the time of the incident, all count and can impact how a witness remembers an event.  How about this: Does a person wear contacts or glasses and did he/she have them on during the incident? Looking at these factors, just to name a few, are key and can ultimately allow the defense to pick apart a witness’ statement show whether there has been taint.

Now that we know a little more about the concerns of defense counsel when dealing with witness memories, let’s hear from an expert about the reliability of such memories!

 

What do the experts have to say?

Now that you know the concerns of defense counsel in the Golden State Killer case, you may be wondering about the science behind tainted memories. If so, you’ll have to wait for another post on the subject in the near future. One of our members, a forensic psychology expert witness, is busy answering a litany of questions on the topic. As a primer, you may wish to read these articles on the related topic of faulty eyewitness identification.

 

Criminal LawExpert WitnessForensic Psychiatry

Golden State Killer, Part 2: Forensic Psychiatry and the Rapist and Serial Killer

As readers of Part 1 are aware, I’m following this case closely due to the connection to our local community. If you are anything like me, you wonder how someone could allegedly commit so many heinous crimes? Then, after a decade of committing dozens of rapes and multiple murders, the suspect ends his reign of terror (at least as far as we know).

What We Know:

From 1976 to 1986, a violent criminal struck fear throughout the State of California. Twelve murders, 45 or more rapes, and more than 100 hundred residential burglaries are attributed to one man. Authorities have indicated the suspect was meticulous in the planning of his crimes, which started as burglaries and escalated into violent offenses.

The crime spree spanned Northern and Southern California, including Sacramento, San Joaquin, Orange, Ventura, and Contra Costa Counties. The suspect was known by many names, such as Visalia Ransacker, Diamond Knot Killer, Original Night Stalker, East Area Rapist, and more recently the Golden State Killer. It wasn’t until a couple of years ago that DNA evidence connected the dots of all the crimes and detectives realized the crimes were committed by the same individual.

An arrest was made in late April. After using an innovative investigative technique (submitting a DNA profile to a free online ancestry database), detectives identified James Joseph DeAngelo, Jr., a former police officer and mechanic living in Citrus Heights, California.

What Makes Someone Commit Such Crimes?

Violent crimes are difficult for most of us to understand. Certainly we’ve all had emotional moments that could have resulted in a terrible decision had we lost self-control or been otherwise unbalanced. Although I don’t condone violence, I’ll admit reading about crimes where the violent result was understandable. Not acceptable, but understandable. For example, a parent acting violently towards someone who harmed his or her child is the type of violent behavior I can understand.

How do we reconcile vengeful, “loss of control,” or “heat of passion,” violence with violence that seems to be done for pleasure? Why does an offender experience joy from inflicting pain and fear upon a victim? What causes a person to lead a life of rape and murder?

There are so many questions on this topic. Does a lack of understanding make us more fearful? Does the human condition require a rational explanation for irrational acts we cannot fathom?

A little information before we continue:

For this portion of our series on the Golden State Killer, I sought input from a forensic psychiatry expert witness. Part 3 of this series will include input from one or more forensic psychologists.

It is important for readers to understand the difference between psychiatry and psychology. Allow me to differentiate between the two. For any psychologists and psychiatrists reading this post, I apologize for the very simplified descriptions of your professions, but we’ve had lawyers contact us looking for an expert, unaware of the distinction.

A psychiatrist is a medical doctor (MD, DO) capable of prescribing medications to address mental, emotional, and behavioral disorders. They generally focus on diagnosis and treatment. A psychologist is not a medical doctor. Psychology-based doctoral degrees are usually Ph.D or Psy.D. They generally are unable to prescribe medication and focus more on helping patients to effectively cope with mental, emotional, or behavioral disorders via psychotherapy (non-medical treatment). Again, this is an oversimplification of two highly complex professions.

Today, we will be addressing the Golden State Killer with some input from Experts.com member and forensic psychiatry expert, Dr. Stephen M. Raffle.

Stephen M. Raffle, MD – Forensic Psychiatry Expert Witness:

Dr. Stephen Raffle is double board-certified in Psychiatry and Forensic Psychiatry. He has over 40 years of experience as a clinical and forensic psychiatrist offering his expert opinion in federal and state jurisdictions nationwide. Dr. Raffle has conducted over 5,000 psychiatric assessments in his career and was a professor of psychiatry at UCSF Medical Center for 20 years. You can learn more about Dr. Raffle by visiting his website: psychiatristexpertwitness.com.

Nick: Are there common psychological attributes among serial killers?

Dr. Raffle: A common feature is a lack of empathy with victims. Most serial killers ​(with few exceptions) understand they are committing a crime because they take care not to be caught. Antisocial Personality Disorder and Borderline Personality Disorder commonly are present. Sadomasochism is also a common feature. Depending on the shared characteristics of the victims, the serial killer may have problems with impotence, paranoia, or sexual perversions which cannot otherwise be satisfied. Paranoid Schizophrenia is a common psychiatric disorder but not universal. A diagnosis of paranoid schizophrenia, in and of itself, does not necessarily justify a finding of insanity, because “insanity” is a legal construct, not a psychiatric diagnosis.

Nick: If so, what types of psychological attributes are common among serial killers?

Dr. Raffle: Refer to my response in No. 1 above. In addition, the psychiatric disorders, as diagnostic entities, may include:  ​Sadomasochistic Personality Disorder, Necrophilia, Paranoid Schizophrenia, Borderline Personality Disorder, Antisocial Personality Disorder, or other psychotic disorders.

Nick: Does a serial rapist or serial killer experience joy or pleasure from tormenting and harming their victims?

Dr. Raffle: Yes.

Nick: If so, why is it they experience joy or pleasure from inflicting pain or committing murder?

Dr. Raffle: In each instance, the torture is combined with sexual arousal (which is commonly not acknowledged by the perpetrator), leading to an emotional discharge, often overtly sexual in nature​ upon the death of the victim. Following the murder, serial killers have recurrent fantasies about various aspects of the ritual associated with the killing, which brings satisfaction. Over time, the recurrent fantasies become progressively less satisfying, (i.e., “old news”) resulting in a need for new fantasy material. Hence, the serial nature of the murders.

Nick: Can forensic psychiatry explain how one becomes a serial killer? Or, what causes one to become a serial killer?

Dr. Raffle: The prediction of violence in a specific individual is difficult, given the extremely rare occurrence of serial killers. Certain risk factors are identifiable for predisposing an individual to violence; however, the constellation of symptoms, behaviors, life experiences and genetic makeup makes it impossible to identify serial killers before the fact or even to explain how one “becomes a serial killer.” That said, a propensity toward violence most commonly occurs in individuals who have a prior history of violence, premeditated violence, paranoia, a strong impulse for revenge, drug and/or alcohol abuse, Antisocial Personality Disorder, Borderline Personality Disorder, the experience of repeated childhood sexual abuse and/or physical abuse, obsessional thinking, unresolved gender identity issues, sadomasochism, and conflicts about dominance/submission. The causes to become a serial killer commonly include prior sexual fantasies, coupled with torture ending in murder. The shift from fantasy to reality may occur following a personal crisis and need for greater satisfaction than is provided by the fantasy. Once the taboo of murder is breached, the serial killer is freer to convert subsequent emotional needs into murderous actions. Most serial killers have a ritualistic aspect to their killing which reflects their unconscious needs and conflicts, such as killing prostitutes, homosexuals, homeless people, or other such categories. The commonality of the victims usually is based on childhood experiences, parental attitudes, and psychosexual conflicts.

Nick: Are there common childhood development (characteristics or circumstances) issues among serial killers?

Dr. Raffle: The most common childhood development characteristics and circumstances include parental neglect, inconsistent parental behaviors, resulting in excessive, unpredictable punishment​ unrelated to wrongdoing, physical or sexual abuse by a parent or close relative, extreme religious beliefs, isolative behaviors as a child, poor impulse control, conduct disorder during childhood, victimization of various sorts during childhood, to name several.

Nick: News reports indicate the Golden State Killer was active between 1976 and 1986. Is it likely he stopped committing these crimes?

Dr. Raffle: On a probability basis, he didn’t stop committing his crimes after 1986. The nature of his fantasies may have changed over time such that subsequent murders were dissimilar enough from the earlier murders that they don’t share enough commonality to identify him as the perpetrator.

Nick: Is it uncommon for a serial killer to stop committing crimes?

Dr. Raffle: It is common for a serial killer to continue committing crimes.

Nick: Are there items you think the public should know about forensic psychiatry, as it relates to the Golden State Killer, that I have not covered in the above questions?

Dr. Raffle:

a) Serial murder is an extremely uncommon occurrence. It is extremely difficult to prospectively predict a particular person will become a serial killer, irrespective of the forensic psychiatrist’s ability.

b) The ritualistic behaviors of a serial killer do not define insanity or even suggest it​. Serial killers as a group are cunning individuals who seek not to be caught, who do not confess, and who obtain considerable self-satisfaction at the expense of their victims.

c) Serial killers as a group do not understand the intrinsic causes of their behavior and are extremely unlikely to be cured of their obsessional murdering. As the practice of psychiatry now exists, it is unreasonable to expect successful treatment of a serial killer.

d) The FBI Behavioral Studies Unit has interviewed and analyzed all of the serial killers who have been brought to justice. Certain statistical profiles exist which assist law enforcement to “profile” a serial killer based upon the victim type and associated rituals. Roy Hazelwood headed the unit for approximately 20 years and probably knows more about serial murderers than anyone else. His work has been instrumental in creating “profilers.”

e) The psychological makeup of serial killers is different from mass murderers. Serial killers who kill by sniping random people or cars are psychologically more similar to the mass murderer than the serial killer because they usually snipe more than one person during a shooting episode.

f) Contract killers are not serial killers. The mentality of a paid assassin is essentially that of an antisocial ​person who does not empathize with his victims and is therefore comfortable earning his or her living killing others. The obsessional quality or ritualistic behavior of the serial killer is not shared with the assassin. Their only common ground is they have killed more than once. The difference is the assassin is told whom to kill and is paid for it; whereas the serial murderer chooses his victims and engages in other behaviors in addition to a murder which satisfies unconscious needs. Conceptually, as serial murderers go, the assassin is “professional” and the serial murderer is a “hobbyist.”

Stay Tuned:

A huge thank you to Dr. Raffle for his very thorough insight into the mind of the Golden State Killer. Next week we’ll be bringing you more insights on the psychological nature of this perpetrator with input from some of our forensic psychology expert witnesses.

 

 

 

Criminal JusticeCriminal LawForensic DNA

Golden State Killer, Part 1: Experts Explain Forensic DNA Evidence

This marks the first blog post I’ve written on a local event of national concern, the arrest of the Golden State Killer. The subject matter is sensitive for many involved, as such I aim to treat the topic with respect. There are significant issues related to the use of expert witnesses in a matter of this magnitude (DNA, ballistics, crime scene investigation and reconstruction, forensic psychology, forensic psychiatry, and more), so I have opted to address those issues with the input of appropriate experts.

In the week and a half since the arrest of suspected Golden State Killer, Joseph James DeAngelo, Jr., those of us in Northern California have been inundated with news reports about the crimes attributed to this prolific serial rapist and murderer who lived less than an hours drive from the Experts.com corporate office.

Prior to the arrest, I only knew bits and pieces about the history of the Golden State Killer (AKA: East Area Rapist, Original Night Stalker, Visalia Ransacker). Little did I know that several of the attacks (rapes) happened in my hometown of Stockton, California, putting the city and San Joaquin County on edge in late 1977 to early 1978. The Stockton attacks took place before and after many similar attacks in neighboring Sacramento and Stanislaus Counties, so the entire Central Valley was nervous. Attacks in Stockton apparently resulted in my parents installing their first alarm system.

How did the police locate the suspect?

The Sacramento Bee, has published many articles on the subject since the story first broke at the end of April. They have done some incredibly thorough reporting and I have used their reporting as a guide to writing this article.

It seems investigators had DNA samples from rape victims for decades. The only problem was the DNA samples did not match any of the DNA in criminal databases maintained by law enforcement. This means the suspect had never been caught for any crime and thus his DNA had never been submitted to one of the criminal DNA databases.

Following up on the Golden State Killer cold case, investigators decided to use an open-source genealogy database called GEDmatch. This is similar to the paid services of Ancestry.com and 23andMe, only it is mostly free to the public. Once the DNA profile was uploaded, investigators discovered a pool of potential candidates or relatives with similar genes. From there, they were able to eliminate suspects due to age, sex, location, etc. Eventually, they filtered down to the only suspect who made sense: Joseph James DeAngelo, Jr. After surveilling the suspect, DNA samples were obtained from items he discarded. Investigators then compared those samples to the Golden State Killer DNA. After a several attempts, detectives discovered a solid match and arrested DeAngelo.

DNA evidence is complicated, so I reached out to several of our members to discuss the DNA evidence involved in this case. Two Experts.com members responded to my questions for the first portion of this series on forensics.

DNA

Suzanna Ryan – Forensic Serology & DNA Expert Witness:

Blog readers may remember a really fun and informative live interview I did with forensic serology and DNA expert, Suzanna Ryan. She provided live and recorded viewers with some fascinating information on forensic DNA analysis. Naturally,  I reached out to her for input on the Golden State Killer case.

It is important for readers to remember we are only commenting on publicly available information from news reports. As in previous articles, I have outlined my questions and Ms. Ryan’s answers below. To learn more about her practice, please visit her website: ryanforensicdna.com.

Questions:

Nick: What are the types/forms of DNA evidence law enforcement is likely to have retrieved from Golden State Killer crime scenes?

Ms. Ryan: I am not sure I know enough about the cases to say for sure, but it sounds like at least some of the cases involved rape, so it is likely that in the mid-70s and mid-80s the perpetrator was not being very careful about not leaving his DNA – in the form of semen – behind.  There is a lot of DNA in semen and it is likely that a clean, single source profile was able to be obtained from those type of samples.  That is probably how the cases were linked to each other as well.

Nick: Is there a type/form of DNA that is more compelling or stronger evidence than other types?

Ms. Ryan: Body fluid DNA is typically,  in my view, more compelling evidence because it is more difficult to argue that the DNA arrived there inadvertently through some sort of secondary transfer. This is especially true if the perpetrator and victim did not know each other and there would be no reason for the perpetrator’s blood to be in the victim’s home, for example, or his semen in her body.

Nick: According to news reports, the last known Golden State Killer crime took place in 1986. Does DNA evidence degrade over time?

Ms. Ryan: DNA evidence can degrade over time, but if it is properly stored (i.e. in paper, not plastic and in a temperature controlled environment like an indoor property room – NOT in an attic, garage, or non-temperature controlled shed of some sort) then DNA profiles can be obtained many years later.  Heat, humidity, and moisture are all very detrimental to DNA evidence.

Nick: How does law enforcement maintain DNA evidence over decades?

Ms. Ryan: Once a profile is obtained from an item of evidence, that profile is stored electronically.  However, evidence that has not been tested or is part of an unsolved case will be stored in police evidence rooms, categorized by case number.  It should remain sealed and in paper bags, manila envelopes, or boxes.

Nick: From public reports, we know law enforcement has found a DNA match. What type of evidence will the prosecution have to present at trial to prove the DNA belongs to the suspect?

Ms. Ryan: I don’t know the answer to this.  Likely semen DNA evidence.  Possibly blood or even touch DNA at some of the crime scenes if re-testing or additional testing of evidence is conducted.

Nick: Are there arguments the defense can use to claim the DNA is not from the suspect?

Ms. Ryan: I’m sure there are.  No way to answer this unless the case files are reviewed. However, when you have multiple cases linked together combined with a database-type match like this (in other words, he wasn’t a suspect before but was found through searching one type of database or another) it becomes more difficult to argue that there is some sort of laboratory error or cross-contamination in the lab.

Nick: Are there items you think the public should know about DNA evidence that I have not covered in the above questions?

Ms. Ryan: You didn’t really ask about the whole forensic genealogy aspect to this.  That the investigators used a private lab (not sure who, but I suspect Parabon) to do the same type of DNA typing (SNPs) that ancestry DNA labs do on an evidence sample from the case.  That profile was then uploaded to one (and frankly, probably more than one) DNA sharing site to search for a possible relative.  There is also some news about some other guy in a nursing home being a suspect, etc.  There was apparently similarities in his DNA profile to the GSK, so they got a warrant for his DNA, did a comparison, and found he was excluded.  That doesn’t mean they “got the wrong guy”, etc. that is being played up in the media.  It means that he was a possible suspect because of his DNA, but he was also cleared, because of his DNA.  The police probably followed around and surreptitiously collected DNA from a LOT of guys before they found DeAngelo.  That’s kind of how this type of search goes.  It is similar to, but not the same as familial DNA searching.  That is something the public and media don’t understand.  Familial searching uses the CODIS database to look for near matches.  It works because 46% of offenders have a brother or father who is also incarcerated.

George Schiro – DNA Technical Leader & Forensic Science Expert Witness:

George Schiro is the Lab Director of Scales Biological Laboratory in Brandon, Mississippi. His duties include incorporating DNA Advisory Board (DAB) standards, accountability for the technical operations of the lab, conducting DNA analysis in casework, DNA research, forensic science training, and crime scene investigation. I posed the same questions to Mr. Schiro that were presented to Ms. Ryan. You can learn more about him by visiting his website: forensicscienceresources.com.

Questions:

Nick: What are the types/forms of DNA evidence law enforcement is likely to have retrieved from Golden State Killer crime scenes?

Mr. Schiro: I know that seminal fluid was collected from at least some the crime scenes, and the GSK may have injured himself at some point during one of the many attacks and left blood behind at one or more of the scenes. These are the two most likely sources of DNA found at the scenes. From this biological evidence, they would have done autosomal short tandem repeat (STR) DNA testing on the stains. This generated DNA profiles that the crime labs were able to upload to the Combined DNA Index System (CODIS) DNA database. This was how they originally connected the East Area Rapist (EAR) with the Original Night Stalker (ONS) and knew they were committed by a single individual. The profile in CODIS did not hit on any identifiable individual in the database. A familial search was also conducted at the state level (SDIS) to look for any potential relatives in the CODIS database. No potential relatives were found in the database. They may have also conducted Y chromosome STR (Y STR) DNA analysis on the samples in an effort to find any potential relatives. It is my understanding that they found a rare genetic marker in one of the samples and used a publicly available genealogy database to trace the marker from family members in the database back to Joseph James DeAngelo. They then used a discarded item from Mr. DeAngelo to compare his autosomal STR profile to that of the GSK and they matched the profiles.

Nick: Is there a type/form of DNA that is more compelling or stronger evidence than other types?

Mr. Schiro: Autosomal STR DNA analysis is currently the strongest type of DNA evidence because it remains consistent throughout a person’s life; with a few, rare exceptions, the DNA is the same throughout the individual’s body; the results are highly reproducible; the methods are standardized; and this type of DNA is highly individualizing. Theoretically, enough autosomal STRs are used to distinguish everyone on the planet with the exception of identical twins. Eventually, next generation sequencing (NGS) will probably supplement, and, perhaps, eventually replace autosomal STR DNA analysis as the crime lab tool of choice.

Nick: According to news reports, the last known Golden State Killer crime took place in 1986. Does DNA evidence degrade over time?

Mr. Schiro: DNA will degrade over time if it is exposed to heat, humidity, or ultraviolet (UV) light; however, if it is air-dried when collected and stored at room temperature under climate controlled conditions to reduce humidity, then it can last for decades, perhaps centuries. DNA has been obtained from mummies, so it is a very stable molecule under the right conditions.

Nick: How does law enforcement maintain DNA evidence over decades?

Mr. Schiro: Law enforcement maintains DNA evidence by air drying it upon collection, then keeping it stored in an air-conditioned, secure location where the temperature and humidity can be regulated.

Nick: From public reports, we know law enforcement has found a DNA match. What type of evidence will the prosecution have to present at trial to prove the DNA belongs to the suspect?

Mr. Schiro: They will have to show that the evidence originated from the crime scenes. They can do this by introducing crime scene photographs, videos, investigator notes, and testimony of the people who collected the evidence. They will then have to show that the evidence was stored and preserved properly; and the evidence chain of custody was maintained. They will have to show that the items were tested using validated techniques and that a report was produced. The report can be introduced at trial and the DNA analyst can testify to the tests and results. They will then have to show that a sample was collected from Joseph James DeAngelo and all of the same steps were taken with his sample. Finally, they will have to show how the DNA samples from the crime scenes match the DNA sample from Mr. DeAngelo.

Nick: Are there arguments the defense can use to claim the DNA is not from the suspect?

Mr. Schiro: In a cold case DNA hit, such as this one, and because the DNA is from seminal fluid and, possibly, blood, it will be very difficult to argue that Mr. DeAngelo is not the source of the DNA. Arguments of potential sample switches, contamination, and secondary transfer of DNA will not apply to this kind of case. About the only avenues left to the defense are to challenge the legality of the evidence collection and the legality of obtaining Mr. DeAngelo’s reference sample. They can also argue that Mr. DeAngelo has an identical twin who is the actual killer/rapist, but this might not be a realistic defense.

Nick: Are there items you think the public should know about DNA evidence that I have not covered in the above questions?

Mr. Schiro: No, I think you covered it pretty well. Thanks.

How about some further input:

My friend and colleague, Tamara McCormic of LegalForms.Today, is a legal advocate based in Orange County, California. Tamara works for the Orange County Public Defender in their exoneration unit. She is very knowledgeable about the use of DNA evidence in violent crimes. As several of the alleged murders took place in Orange County, this matter hits close to home for her as well.

I’ve asked Tamara to share her thoughts on the Golden State Killer matter based on her experience in homicide exoneration. A link to her blog post will be made available shortly.