In a more recent review of the available literature, from 2005, the researchers concluded that on average people required 30 days to test negative for THC. These studies, while older, still demonstrate that for most folks, even chronics, it can take less than two weeks to clean weed out of the system. The results from another study, this one from 1984, indicated that 80 percent of users tested clean after 13 days, while the remaining 20 percent took upwards of 40 days to detoxify from THC. Importantly, only one user tested positive after 14 days, while everyone else tested clean after two weeks. Let’s review the science first.Ī 1989 study of chronic marijuana users discovered marijuana stayed in their system for upwards of 25 days. There are a few scientific studies on drug tests, but also many influencing factors, which we’ll get to in a second. The answer is not necessarily a clear-cut timeframe. Which means potential employees need to know how long does THC stay in your urine? How Long Does THC stay in Your Urine? But many companies continue to make drug testing mandatory. It’s now common practice, with little evidence that it actually solves a problem.Īfter all, if an employee smokes weed on their own time, does that affect their job performance? Especially if someone uses marijuana medicinally, it could actually serve to improve job performance. Large national companies started to take note, and soon many companies across the country were following suit. In 1988, Ronald Reagan made it mandatory that all federal employees must submit to drug testing. We have the Reagan era drug policies to blame for this continued practice of drug testing. That equals roughly 350,000 positive tests, most of which were for weed with prescriptions and amphetamines as the runner-ups. Why do Employers Test for Drugs?ĭid you know that in 2014, America’s peed in over 9 million cups for an on the job drug test? Of those tests, less than four percent turned up any results at all. Worse yet, it could include random on-the-job drug testing. If you happen to work for a more-serious minded employer, that just might include an initial drug test.