JAMA, November
Vol 264(20) pp 2676-2677 “Pre-
employment Drug Screening” by Eric D. Wish, Ph.D
... factors suggest that pre-employment drug
testing may have limited potential in the United States. First,
employers should remember that a single positive urine test provides limited
information about a particular employee's level of drug use. ... Furthermore,
lifestyle issues may contribute to an employee's drug use as well as to his or
her poor job performance.
Unfortunately, a medical review officer-type review is not required for
firms testing private sector employees, and job applicants may be denied
positions on the basis of a single positive test result, without their
knowledge and without the right of appeal.