The National Institute of Drug Abuse (NIDA) Human Genetics Initiative is devoted to the collection and distribution of family data for the genetic analysis of drug abuse phenotypes. Anonymous data on family structure, age, sex, clinical status, and diagnosis (“clinical data”), DNA samples and cell line cultures (“biomaterials”), and data derived from genotyping and other genetic analyses of these clinical data and biomaterials (“genetic analysis data”), are distributed to qualified researchers studying the genetics of mental disorders and other complex diseases at recognized biomedical research facilities.