I implemented my own 'no tax on tips' policy years ago.
Only once in the past 25 years has a tip been added to my debit/credit card payment at a restaurant, and THAT WAS NOT VOLUNTARY - it was REQUIRED by the restaurant - in Maryland. Pissed me off, I must say.
I always (save once) pay tips in cash left at the table.
Yes it puts the waiter/waitress in a conundrum - break 'the law' or report the tip. For that, my bad.