The Vienna Inn, in Vienna Virginia, does not leave a check at the table. At the register patrons recite what thy had and are charged on that basis. I’d say they are very close to 100 percent in revenue against orders. It’s not a system that will work everywhere but the Inn, known for its inexpensive chili dogs, makes it work.
I eat there several times a year, usually relating to a food donation they make to a charity event I manage. And sometimes I’m just passing by. Marty and the crew do a great job.
The Vienna Inn also does a bit of stealth monitoring. More than once I have been in the pay line and the big old grey-haired waitress would yell something like “that’s the guy that stiffed you last time.” Embarrasses the hell out of the ‘perp’ and gets a laugh from everyone else. God, those were the days. Haven’t been back there since the mid 90’s.