Abstract
In a period of approximately six years, Wyoming experienced three different laws governing the insanity plea. These were (1) the McNaughton rule with an irresistible impulse clause and a single-faceted trial procedure; (2) ALI rule with bifurcated trial; and (3) ALI rule with single-phased trial. No significant differences were observed in each of these periods with respect to such matters as the frequency and success of the plea, general characteristics of defendants making the plea, and court dispositions of these defendants.
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