Drug screening--the provider's perspective.
D004647:Employee Discipline / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008403:Mass Screening / Q000379:methods*; D009787:Occupational Medicine / Q000592:standards*; D010559:Personnel Management / Q000379:methods*; D019966:Substance-Related Disorders / Q000517:prevention & control*