Differentiating Successful and Unsuccessful Insanity Plea Defendants in Colorado

Abstract

Of 133 Colorado male defendants employing the insanity plea from 1980 to 1983, 36 were adjudicated insane and 97 found guilty. Considering all defendants, they were found to be primarily single, Caucasian, somewhat older and better educated than the usual defendant group, unemployed at the time of the insane offense, and with a history characterized by chronic unemployment, prior psychiatric treatment, drug abuse, alcohol abuse, and previous arrests. Acquittees differed significantly from convicted defendants in being older and better educated. They were more likely to have been diagnosed as schizophrenic and less likely to have had a history of drug abuse. No difference was found between the groups with respect to all other variables examined, including severity of instant offense, ethnicity, and number of prior arrests.