The biosocial study a sample of 487 black males who were born in Philadelphia between 1959 and 1962. Data were collected from school records and police records. Three different measures of juvenile and adult crime were employed: number of offenses, categorization of juvenile offenders according to the most serious offense recorded, and offense seriousness. The study focused on biological, sociological, and environmental influences on crime. Findings showed that the number and seriousness of juvenile offenses strongly predicted adult crime. Juvenile crime was most strongly predicted by disciplinary problems in school, evidence of lead poisoning, amount of time fathers were unemployed, and evidence of abnormal speech and low language achievement. Disciplinary problems in school were most strongly predicted by lead poisoning, anemia, and left-handedness. The study indicated that lead poisoning was pervasive among blacks in urban communities and that it was linked to disciplinary problems and aggression. The author concludes that a lead poisoning criminal defense may be viable if a jury determines that the lead effect significantly contributed to the defendant's loss of control. The issue of criminal responsibility is discussed in the context of the insanity defense. 112 footnotes and 1 table
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