RT Journal Article SR Electronic T1 Survey finds widespread gangs, drug problems in U.S. schools: Only 43 percent report drug-free schools JF The Nation's Health JO Nations Health FD American Public Health Association SP 7 OP 7 VO 40 IS 8 A1 Donya Currie YR 2010 UL http://www.thenationshealth.org/content/40/8/7.1.abstract AB