The problem with doing a drug test for marijuana, though, is that failing the test does not mean you are under the influence.

On average, a drug test can tell if you've smoked marijuana within 3-4 weeks. It varies from person to person, of course, but that's the general range.

Would you say, if someone smoked pot once, a month ago, and they fail a drug test, they should not be able to have insurance cover their injury? Even if they weren't under the influence?