not sure where to begin, I'd like to know what the observable indications are that someone is active using, the situation is staying out all night maybe one or twice a week, no explanation, owns a small mechanic shop, does not bathe regularly, there is no rusty smell, money is coming into the business, but maybe he's being paid in crack, chronic marijuana smoking,we've discussed the out all night, and my issues with that, he says he understands, but he does it (stays out all night)