that is a good question. some research needs to be done on that. wish i knew the answer. could be a money maker. also have to wonder about a new pi** test. you can have a drink and still pass an alcohol test if your not over company limit. it seems they would have to come up with a new test for pot. for sure if you have prescription for mmj. i'm sure they would want to check if you are able to do your job. just a thought.