The county had deaths from cocaine overdoses in 1990 and 23 cases in which multiple drugs were found, compared to 9 cocaine overdose deaths and 42 polydrug cases in 1989. Emergency room data from the Drug Abuse Warning Network revealed moderate increases for cocaine from 1986 through 1989; the absolute numbers declined and the percentage attributable to cocaine increased in 1990. Cocaine admissions to County-funded drug treatment programs in 1990 continued to rise. Except for 1987, heroin has been the leading cause of accidental single- cause overdose deaths in the county for the past 5 years, accounting for 26 deaths in 1990. For the past 3 years, heroin has accounted for at least 30 percent of all drug treatment admissions. In 1990, the 10 deaths from accidental overdoses of methamphetamines decreased to the pre-1988 level. Treatment admissions increased to 40 percent of admissions. Emergency room reports indicated a decline in mentions of marijuana, and marijuana accounted for 4 percent of treatment admissions. Alcohol had a major role in most problem indicators. The county recorded more than 4,000 alcohol admissions to county-funded treatment programs and 12,000 to drinking driver programs. Data were also provided on AIDS and on the price, purity, and availability of selected drugs. Tables and figures