I was smoking a blunt with me ex-girlfriend (girlfriend at the time) when she said that she never smoked weed. I looked at her a little weird and asked her what she meant. She said that while I was gone for the month and a half, she promised that she wouldn't smoke weed. She just looked at me...
Depending on the area of where you want to be a cop is how often you get drug tested. I personally know the sheriff of my hometown, he's been on the job 20+ years and never been tested. Even though a lot of weed is grown, smoked, and sold here, he never got tested.