More economical use of chromatographic plates for drug screening.
D000470:Alkaloids / Q000652:urine; D000662:Amphetamines / Q000652:urine; D002855:Chromatography, Thin Layer / Q000379:methods*; D003365:Costs and Cost Analysis; D006801:Humans; D013194:Staining and Labeling; D019966:Substance-Related Disorders / Q000652:urine*
D000470:Alkaloids; D000662:Amphetamines