Imagine the absurdity of Know-Your-Bank, Know-Your-Merchant, Anti-Counterfeiting-Laws (KYB/KYM/ACL)

What's the best way to verify $20, $50 and $100 bills that come out of the ATM are legit?

Do you record the serial numbers of dollars bills that you get back as change at the grocery store and require full identification of the cashier, store manager on duty, and store owner?