title: A random survey of drug screening proficiency.
abstract: There is little evidence of uniformity of standards of performance as influenced by technical capability and priority of concern for drug-screening proficiency. The objective of this quality-control survey was to illustrate the degree of error associated with toxicological analyses and encourage the use of controls to decrease the possibility of reporting erroneous findings.
mesh_terms: D000293:Adolescent; D003951:Diagnostic Errors; D005069:Evaluation Studies as Topic; D006801:Humans; D008297:Male; D004364:Pharmaceutical Preparations / Q000032:analysis*; D011786:Quality Control; D019966:Substance-Related Disorders / Q000175:diagnosis*
chemical_list: D004364:Pharmaceutical Preparations