A customer who enters a bar will need to present an ID to the person attending the door, running said ID through a scanner which will then refer to the database as to whether said person is old enough to drink, not to mention shooting an image of the patron and ID. This information will then be shared with other bars in the vicinity, and if anything happens, they’re blacklisted with a relevant reasons keyed in.
Guess this is kind of social experiment of sorts goes to show the power of networking, so you had better to be on your best behavior the next time you think of venting your frustration on others after a few rounds of drinks. After all, you wouldn’t want to be banned from other establishments around the area, do you?