"Sir, before you enter the Main Street Pub you have to complete this short 'Member Application Form'... yes, just sign, the rest is filled out for you."
There was an after-hours club in Indianapolis back in the mid 90s. It was technically a private club, that was the way to stay open past 2. Membership cost $1. They gave you a card for your wallet that you had to sign. You showed it with your ID.
How is it a loophole to take affitmative measures to ensure everyone there wanted to be there?