This second survey of drug and alcohol use among 7th, 9th, and 11th grade students enrolled in California's public secondary schools was conducted from December 1987 to February 1988. The purpose of this survey was to provide information on levels of substance use and related attitudes and experiences among young people who are enrolled in public schools. The survey also sought to determine whether substance use among California teenagers has increased or decreased since the initial survey. The survey was administered to 7,022 7th, 9th, and 11th grade students enrolled in 44 senior and 42 junior high or middle schools. The results indicated that: (1) frequency of use of alcohol had remained virtually constant over the 2-year period; (2) frequency of use of illicit drugs had generally declined, as has polydrug use; (3) the percent of 9th grade students who reported using marijuana at least once over the previous 6 months dropped from 32 percent to 22 percent; and (4) weekly or more frequent use of marijuana dropped from 9 percent to 4 percent for grade 9 and from 13 percent to 8.5 percent for 11th graders. (ABL)