Some companies look to drop marijuana testing for new hires 

Amazon changed the way many people do business, going from local shops to click and order. Now, the company is stopping marijuana drug testing for new applicants.

…  Cannabis can stay in your system for up to 30 days. Most legal lawsuits against employers, Birmingham said, are over the accuracy of the test.

Since it stays in the system so long that’s one of the reasons why companies have been backing away from it,“ he said.  "It’s very difficult to tell when did the person use marijuana, or did it really affect them? Does it have any impact on their job performance?”