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Bill Cosby sexual assault defense: Challenging the memory of witnesses?

Bill Cosby's lawyers filed a motion for a competency hearing, but some psychologists and legal experts say cross-examination could be a better way to assess accusers' memories. 

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Mel Evans/AP
Bill Cosby (r.) arrives for a hearing in his sexual assault case at the Montgomery County Courthouse on Tuesday, in Norristown, Pa.

If a Pennsylvania judge permits 13 women who have accused Bill Cosby of sexual assaulting them to testify in another woman鈥檚 trial, the defense wants to assess the competency of the women鈥檚 memories.

In a motion Mr. Cosby鈥檚 lawyers filed Monday, they argueMontgomery County Judge Steven O鈥橬eill should allow competency hearings for any of the 13 women he lets testify because an expert on the malleability of human memory says theirs could be tainted.

鈥淪cience tells us that ,鈥 wrote Brian McMonagleand Angela Agrusa in the motion. The state 鈥渉as asked the court to bring before the jury 13 individuals to speak of witness-less, evidence-less allegations of misconduct, ranging from hair-stroking to violent assault, that they now claim occurred in eras long passed-indeed, from almost a half-century ago (1967) to over 20 years ago (1996) and all well before Andrea Constand ever spent an evening with the defendant in 2004.鈥

Competency hearings typically evaluate a defendant or a child鈥檚 abilities to be a witness and cooperate in court. Because most adults are presumed competent, this motion could just serve as a preview of the defense鈥檚 strategy 鈥 discredit the accounts of the accusers. If Judge O鈥橬eill were to grant the motion, however, it could open up a new line of defense against rape, as a number of states have extended or lifted the statute of limitations for rape victims to seek charges in response to dozens of accusations against Cosby.

Though science suggests victims鈥 memories of rape can change over time, some legal experts and psychologists disagree over whether a competency hearing is the best approach. Instead, they advocate for cross-examination, allowing a judge and jury to assess the totality of the evidence 鈥 the witnesses鈥 memory, physical evidence, and other arguments 鈥 to determine which side they believe more.

鈥淭hat鈥檚 the whole justice system 鈥撎齝ross-examination,鈥 says Barbara Ashcroft, director of the trial advocacy program at Temple University Beasley School of Law in Philadelphia, and a former prosecutor in the Montgomery Country District Attorney鈥檚 Office, where Mr. Cosby is accused of sexually assaulting Ms. Constand. Ms. Ashcroft was not involved in the prosecution鈥檚 investigation听but has been following the case.

Cross-examination allows jurors to 鈥渉ave a framework of where to put the evidence, and understand the story of whichever side they tend believe more,鈥 she tells 海角大神 in a phone interview Tuesday. 鈥淏ecause competency is presumed, it鈥檚 odd in this particular case.鈥

The defense submitted the motion on the eve of a two-day, pre-trial hearing, in which O鈥橬eill is expected to rule on several questions. One is whether 13 of the 60 women who have accused Cosby of sexual assault can testify for the prosecution.

The prosecution has said it intends to show a pattern 鈥溾 by Cosby, now in his late 70s, and diagnosed as blind, according to the Associated Press. Courts can allow such testimony if it shows a very specific 鈥渟ignature鈥 crime pattern.

Starting in 2014, five-dozen women have come forward to accuse the comedian of sexual assault. But Cosby, once the star of the television show that bears his name, only faces criminal charges for one complaint.

Stemming from a 2004 encounter with Constand, Cosby has been charged with three counts of aggravated, indecent, sexual assault. Constand was a Temple University employee when she came to Cosby鈥檚 home outside of Philadelphia. She has said that there Cosby drugged her and assaulted her, an account similar to the accusations of the dozens of other women.

But the defense argues some of the 13 women who could testify will be asked to remember events that occurred nearly 50 years ago, which concerns the defense鈥檚 expert on memory, psychologist Elizabeth Loftus.

"In my professional opinion, people鈥檚 recollections of events that transpired 20 years ago have a high probability of being tainted by the passage of time alone鈥 she said, according to the motion.

The defense cites the affect the circumstances of an event, the span of time, and media coverage can have on a person鈥檚 memory.

鈥淩etrieving memory is not like replaying a video recording of an event that took place, but rather it is process by which people take bits and pieces of the information available to them at the time of retrieval and create what feels like a memory of what happened,鈥 continued Dr. Loftus. 鈥淩emembering involves the act of reconstructing what must have happened, using some stored fragment of information.鈥

Melissa Jenkins Mangili, a neuropsychologist and expert on memory, said it would be appropriate for the court to examine the consistency of facts to see if they have changed over time. But she also says that it should be done through cross-examinations, not competency hearings, she writes to the Monitor in an email.听

Competency hearings shed 鈥渓ittle light on the type of autobiographical memory required to recall personally relevant details over long periods of time,鈥 she writes.

鈥淚 think judges and juries assess credibility, in part, by the consistency of the accuser's report and the presence of objective information that verifies that report (DNA, eyewitnesses, or other objective data) as well as their own subjective assessment of the credibility of that individual,鈥 she adds. 鈥淭here's not a perfect solution, so we trust the convergence of data (multiple witnesses reporting the same thing, subjective reports that line up with objective evidence) as the best solution.鈥

The reliability of memory in the courtroom, especially in rape cases, has been a subject of debate for some time. In 1994, for instance, a Southern California father was the first to for implanting false memories through a type of therapy, recovered memory therapy,听that he sexually assaulted his daughter. The debate has intensified in recent years because of the Cosby accusations, rising awareness of sexual assaults in the military, and the alleged, but disproven gang rape of a female freshman at the University of Virginia, as reported by Rolling Stone magazine.

The testimonies of dozens of women who have accused Cosby of rape have inspired several states to pass legislation that extended or lifted the statute of limitations. The laws were significant since . But when California lifted its statute of limitations in September, opponents of the law said the span of time the law allows could lead to more wrongful convictions. They about the reconstruction of events using fallible evidence, such as witness testimony.

But a Washington Post found that while victims鈥 memories of a rape might be hazy, they are rarely false. False allegations make up between 2 to 10 percent of assault cases reported to police, according to a 2010 peer-reviewed study published in the journal Violence Against Women, which the Post cited.

Ms. Ashcroft, the law professor and former prosecutor, says it鈥檚 up to O鈥橬eill to decide, then, how much testimony he will allow. Either way, however, the motion is a preview of Cosby鈥檚 defense.

鈥淭his is the direction the defense is going to go with this case: time has deteriorated the memories of any of these potential witnesses,鈥 she says.

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