The Mednick study found that the highest predictability for future criminality was among adopted youth whose biological parents and adoptive parents were convicted of a crime.

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The Mednick study indeed found that adopted youth had the highest predictability for future criminality when both their biological and adoptive parents had a history of criminal convictions, suggesting the interaction of genetic predispositions and environmental factors in the development of criminal behavior.

The Mednick Study Found That the Highest Predictability for Future