For Defendants with Retardation, Procedures Vary: Expert Witnesses in Death Penalty Cases Must Know Standards of Proof Differ from State to State

By Finn, Robert | Clinical Psychiatry News, May 2008 | Go to article overview

For Defendants with Retardation, Procedures Vary: Expert Witnesses in Death Penalty Cases Must Know Standards of Proof Differ from State to State


Finn, Robert, Clinical Psychiatry News


SAN FRANCISCO -- The U.S. Supreme Court decision that executing mentally retarded offenders is unconstitutional provided little guidance on how to implement the ruling. The result has been a mishmash of procedures that vary widely from state to state, Dr. Clarence Watson and Dr. Kenneth Weiss said at the annual meeting of the American College of Forensic Psychiatry.

"It's important to know what the procedures are where you live and where you practice," said Dr. Weiss, a forensic psychiatrist in Bala Cynwyd, Pa. Psychiatrists and other mental health professionals are likely to become involved as expert witnesses in these cases.

Seventeen of the 36 death penalty states had statutes regarding mental retardation and the death penalty before the Supreme Court's 2002 decision in Atkins v. Virginia. An additional eight states have enacted statutes since the Atkins decision. Eleven legislatures have so far been silent on the matter, but among those are five in which there is a relevant case law. In the absence of a statute or case law, judges, prosecutors, and defense attorneys must rely on adhoc procedures. (See graphic.)

"Because there's a constitutional ban on executing the retarded, courts and states, and judges have to make it reasonably easy--without tipping it too much in the defendant's favor--for individuals with mental retardation to prove it," said Dr. Watson of Jefferson Medical College, Philadelphia. "They can't put too many roadblocks in the way."

The laws and procedures vary based on these considerations:

* Standard of proof. Must mental retardation be proved "beyond a reasonable doubt" as guilt or innocence is? Can it be proved by a mere "preponderance of the evidence," meaning anything more than 50% certainty the standard in civil cases? Or should the standard be "clear and convincing evidence," often described as 75% certainty?

* Burden of proof. Is this burden on the prosecution or the defense?

* Fact finder. Who makes the final determination, the judge or the jury?

* Timing. Is the determination made before the trial, during the penalty phase, or both?

* Definition of mental retardation. Should the definition be based on the DSM-IV-TR or the slightly different definition used by the American Association of Intellectual and Developmental Disabilities (formerly the American Association on Mental Retardation)?

A consensus appears to be developing in favor of the DSM-IV-TR definition, Dr. Weiss said. This definition relies on IQ scores of about 70 or below, at least two standard deviations below the mean; impairments in adaptive functioning or the effectiveness by which individuals cope with common life demands; and an onset before age 18 years. …

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