I'm gonna help my customer do the right thing.
What do you mean by that?
If he tries to not pay his bill, I'm going to drug him.
Wanting your customers to pay their bills is fine but causing them physical harm when they don't is not acceptable.  You should take it to the proper authorities if they refuse to pay but you should never try to hurt anyone.
Forget that, I'm gonna go kidnap and drug them.
That could get you arrested at the very least.