Back in my university days there were bars that explicitly stated that passports were not a valid form of ID for determining whether or not you were old enough to drink there. Didn't make a lot of sense to me at the time, since they were far more stringent in their requirements for getting one than a drivers' license.

The only place I've been to that actually scans a license is Bevmo, and I don't think those barcodes have much in the way of security features to actually ensure they're generated by a state government.