Dr. Wade Silverman, Ph.D | home
Competency to Stand Trial and Cognitive Functioning
There are about 25,000 competence to stand trial evaluations (CST) performed each year.
In Dade County these evaluations are carried out by psychologists and psychiatrists broadly using
the Dusky standard. We are to examine the defendant taking into account following seven
factors: 1. Appreciation of the charges against the defendant. 2. Appreciation of the range and
nature of the possible penalties. 3. Understanding of the adversarial nature of the legal process. 4.
The capacity to disclose to attorney facts pertinent to the proceedings. 5. Ability to manifest
appropriate courtroom behavior. 6. Capacity to testify relevantly. 7. Any other factors deemed
relevant.
The most frequently used assessments include a mental status exam and some form of
psychological testing such as the Minnesota Multi phasic Inventory, the Symptomatic Checklist-
90-R, or the Mac Arthur Competency Assessment Tool. Since professional and financial
resources are scarce in Dade county, we all try to do our best within a narrow time frame.
This presents even more difficulty than first imagined because of the ever increasing complexity
of the task. Previously, mental health professionals usually base their evaluations on the notion
that mental illness or psychosis to an assessment of incompetency.
Recent findings by Nestor, Daggett, Haycock, and Price in Law and Human Behavior
Volume 23 1999 calls into question our present form of assessment. They indicate that a
different set of psychological measures are also extremely important in this evaluation, mainly
cognitive tests. They examined retrospectively 309 patients over an 8 year period. From this
sample they identified 181 patients who had undergone CST evaluations. They compared
neurological test scores on those recommended as competent versus those recommended as
incompetent. Salient variables were indexes of intelligence, memory, attention, and
concentration. The most predictive of these tests were those of memory, particularly verbal
memory. There were no differences on standardized tests of academic skills or executive
functions.
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