Why don't you install a breathalyzer ignition lock in his car?QUOTE]
Best advice given in this thread. And yes he needs to be confronted.
But what would the cops do if you reported him? It would only be useful to report him if he were driving drunk at the time. Otherwise, in the unlikely event the police actually had enough time to visit him, all he would get is a lecture from a cop. Might scare him, but really, if he was not actually driving drunk at the time of their visit, they couldn't do anything but record that they received a complaint, visited the person about whom the complaint was made, found him stone cold sober, gave him a lecture on the perils of driving drunk, registered his counter-complaint that he was being slandered and harassed by the complaintant, then left. But, in conjunction with other interventionist actions, it might help to straighten him out. I wouldn't pin my hopes on the police solving the problem though.