They would really be in a quandary if they had to resort to that, since “race is a social construct”, unless there are “too many whites” in a given location.
Put the onus on them to “prove” who is “black” and who is “white”.
Up till now they simply rely on what you think you are.
Force the race hustlers to put all their cards on the table.
Enjoy your Nuremburg laws.