Workers’ Positive Drug Tests Highest in Twelve Years

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Quest Diagnostics said marijuana remains the most commonly used drug among U.S. workers and was identified in 2.5 percent of urine tests 2016, up from 2.4 percent a year earlier. Workers in states that permit recreational marijuana use appear to be picking up the habit. The number of workers testing positive in Colorado rose 11 percent; in Washington—9 percent . . .

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