Man is happened to a warehouse guy at a store I worked at. His name was Mike and he was the forklift driver. He was the only one qualified to do it, and he was great. He was early every day, never took late lunches, was personable, and was more than happy to help with non-forklift-related things.

One day one of the audio department idiots was looking for a replacement item for a customer and ripped open the shrink wrap of a palette and didn't re-wrap it or tell Mike it was open. A bit later Mike goes to move that palette and boom, high-end electronics fall ten feet to the concrete floor and are destroyed.

Store policy is a mandatory drug test. Mike was very much not the kind of guy to do drugs -- he was like a black Hank Hill -- but he failed and was fired the next day.

We were all very confused about it until he came back a few days later to get his last check. He tested positive for marijuana (then illegal here). Turns out that while he himself doesn't smoke it, his wife did all day for medical reasons and he'd just been home for lunch.

The managers understood but their hands were tied. It sucked for everyone all around.