title: Testing for drugs. II. Techniques and issues.
mesh_terms: D000937:Antigen-Antibody Reactions; D002849:Chromatography, Gas; D002855:Chromatography, Thin Layer; D004796:Clinical Enzyme Tests; D004578:Electron Spin Resonance Spectroscopy; D005188:False Negative Reactions; D005189:False Positive Reactions; D005470:Fluorometry; D005609:Free Radicals; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D007118:Immunoassay; D008722:Methods; D009269:Nalorphine; D009294:Narcotics / Q000652:urine; D011863:Radioimmunoassay; D019966:Substance-Related Disorders / Q000175:diagnosis / Q000652:urine*; D014556:Urine / Q000032:analysis*
chemical_list: D005609:Free Radicals; D009294:Narcotics; D009269:Nalorphine