Don't allow kids to get away with using a fake ID. Take the
pressure off your doorman & by having your customers register
biometrically. It's a "win-win" situation for all involved.
You will be assured that customers are of legal age, & customers
will be able to use a fingertip instead of relying on an easy-to-lose
ID card. One swipe of a finger on the scanner, and you'll know
for sure.