Does Drug Use Inhibit Crime Deceleration or Does Crime Inhibit Drug Use Deceleration? A Test of the Reciprocal Risk Postulate of the Worst of Both Worlds Hypothesis.

The results of this study suggest that illicit drug use may inhibit the natural maturing out of crime process observed in emerging adults whereas involvement in crime may inhibit the natural maturing out of illicit drug use process. These findings not only support the reciprocal risk postulate from the Worst of Both Worlds hypothesis but also have implications for risk prediction, risk management, and treatment.