Coming clean about needle exchange.
D000163:Acquired Immunodeficiency Syndrome / Q000517:prevention & control / Q000635:transmission; D015658:HIV Infections / Q000517:prevention & control / Q000635:transmission; D006801:Humans; D018671:Needle-Exchange Programs / Q000331:legislation & jurisprudence*; D015819:Substance Abuse, Intravenous; D014481:United States