Studies of drug use among youth involved in the juvenile justice system indicate high levels of abuse. Since 1990, the Drug Use Forecasting (DUF) program conducted by the National Institute of Justice has measured substance abuse among male detainees/arrestees in 12 jurisdictions across the country. Like the data from the Monitoring the Future study, the DUF data show increases in illicit drug use by youth in nearly all sites between 1993 and 1995. In 1995, youth testing positive for at least one drug ranged from 19 percent in Portland, OR, to 58 percent in Washington, D.C. DUF data, which do not include information on alcohol use by juveniles, showed in 1995 that the illicit drug most frequently used by delinquent youth was marijuana (National
