His wife takes a lot of medication regularly for some health issues.
He was also prescribed one of the same medicines by a doctor for weight loss.

His wife isn't careful with meds and mixes her medication together in one bottle that's easy to keep track of. Well, one day he went to take his and they were gone. His wife told him that she'd mixed his pills in with hers. He grabbed a pill out of her bottle but took the wrong one.

He was drug tested within the next few days and failed the test because of his wife's medication that was in his system. His employment was immediately terminated. After a bit of a battle, they agreed to take him back with a demotion if he would finish a drug rehab program. He resisted that at first because he was so frustrated, but eventually went ahead with it and got his job back.