Systematic observations made in Washington. D.C., documented the epidemic spread of heroin use and its subsequent decline. Major indicators supporting the contention of reduced heroin use include: 1) a stable year of peak heroin use among all treatment cohorts admitted since January 1971; 2) a marked reduction in deaths due to heroin overdose; 3) a steady decline in the number of urine tests positive for heroin among arrestees tested; 4) a sharp reduction in the annual number of narcotics arrests; 5) a sustained reduction in the demand for heroin addiction treatment; and 6) a significant increase in the mean age of identified heroin users.Abstract Teaser