Sorry to hear that you are dealing with this, queenteree. It seems that this journey is never ending, doesn't it?
Thing is, drinking is legal. Being drunk is legal. The cops can't do anything about that, unless he is breaking a specific law. Of course, if it is a probation violation then that's a different matter. But how does the PO know of a violation unless they are told? (I don't know how probation works).
When you set your boundaries, what consequences did you attach to them?
And what outcome do you want to see?