RT Journal Article SR Electronic T1 Workplace urine screening for drug abuse. JF Journal of Medical Ethics JO J Med Ethics FD BMJ Publishing Group Ltd and Institute of Medical Ethics SP 191 OP 191 DO 10.1136/jme.23.3.191 VO 23 IS 3 A1 D S Wright YR 1997 UL http://jme.bmj.com/content/23/3/191.abstract AB