Quality control program in the USA.
D002487:Centers for Disease Control and Prevention, U.S.; D006801:Humans; D013287:Illicit Drugs / Q000652:urine*; D008722:Methods; D004364:Pharmaceutical Preparations / Q000652:urine*; D011786:Quality Control; D019966:Substance-Related Disorders / Q000188:drug therapy* / Q000652:urine; D014481:United States
D013287:Illicit Drugs; D004364:Pharmaceutical Preparations