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Cross-sectional and longitudinal analyses were used to examine the criminal histories of male psychopaths and nonpsychopaths. Dependent variables included time spent in prison and conviction rates during each 5-year period between the ages of 16–45 years. Both types of analysis indicated that the criminal activities of nonpsychopaths were relatively constant over the years, whereas those of psychopaths remained high until around age 40, after which they declined dramatically. Nevertheless, more than half of the subjects in each group still received at least one conviction after age 40. The results are consistent with clinical impressions that some psychopaths tend to “burn out” in middle age.