This study investigates trajectories of heroin use and subsequent consequences in a sample of 471 male heroin addicts who were admitted to the California Civil Addict Program in 1964-1965 and followed over 33 years. Applying a two-part growth mixture modeling strategy to heroin use level during the first 16 years of the addiction careers since…

Reliability and validity of self-reported behavior within a deviant population are examined using data from 2 interviews with 323 narcotics addicts conducted 10 years apart (1974-75 and 1985-86). Results complement existing reliability and validity studies of alcohol use, and suggest that quality information can be obtained from heroin users. (SLD)

Whether methadone maintenance treatment demonstrates cumulative (rehabilitative) or stabilizing effects on behavior of narcotics addicts over multiple treatment episodes was studied involving 993 addicts in a quasi-experimental design. Observed behavioral changes and longitudinal self-reports indicate stabilizing, but not cumulative, effects. (SLD)