The percentage of positive drug tests for marijuana in the U.S. general workforce has plummeted by a third in ten years from 2.9 percent to 1.9 percent, the Wall Street Journal reports today. Drug-testing data from one of the biggest U.S. labs, Quest Diagnostics shows positive workplace tests for marijuana have gone down sharply over the last two decades, though "workers may have gotten more sophisticated when it comes to passing drug tests, however, especially for marijuana, as government studies show that its use is rising."
Quest reviewed about 125 million urine drug tests administered from 1988 until now, the vast majority of which were conducted for pre-employment screening. Positive tests for addictive pain pills like Vicodin (hydrocodone), Oxycodone and meth are on the rise. Positive cocaine tests have also fallen.
Drug law reform advocates are going to make hay of the latest numbers. The dramatic drop in positive tests for marijuana comes amid the dramatic rise of medical cannabis laws and adult-use cannabis legalization in two states. Critics promised more drugged workers - not less. Regular marijuana users can expect to fail urinalysis for up to one month after last smoking weed.