In this Feb. 22, 2017 file photo, Medical Assistant Lona Coleman demonstrates the process for the intake of drug screen specimens at Excela Health WORKS Occupational Health Center in Irwin, Pa. Companies drug test in the workplace, either before offering jobs to candidates or after accidents. Advocates say it boosts safety and productivity and cuts personnel problem costs, but business leaders say it complicates the already difficult task of hiring good people. (Christian Tyler Randolph/Pittsburgh Tribune-Review via AP)
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