yeah.. calling the police will really help him
It will help him trust people later on when he starts to think he's slipping back into an addiction
Why is this dude labeled as an addict? Any drug can be used recreationally, it's just that some are harder to keep as a rec habit than others.
The only solution to this is to either stay out of it (which is what I would do) or just let HR know that he's fucking up on the job.. there shouldn't be a mention of drugs. If they piss test him.. guess what.. they aren't going to call the cops either. They'll just suspend him or fire him. It's amazing how much people think they know about drugs and cops and they don't know jack.