A majority of teens say their school is drug free. Sixty-two percent of 12 - 17 year-olds in public schools report their schools are drug-free, compared to 42 percent in 2000. This is the first time in the seven-year history of the survey that a majority of public school students are reporting drug-free schools. Parochial school students are also reporting increases in drug free schools. Seventy-nine percent of students in parochial schools say their school is drug free, compared to 65 percent in 2000. Teens who attend drug-free schools are at roughly half the risk of substance abuse as teens attending schools where drugs are used, kept or sold. Despite the increase in the number of schools that are drug free, 25 percent of students say they have personally witnessed the sale of illegal drugs on school grounds.