What if you're not currently part of a tribe? I also wonder if a company is legally allowed to ask for you to prove that you are more than one race. Seems like they could be opening themselves up to a lawsuit since they're not allowed to discriminate because of race. It would be like asking to prove that you are Jewish, or Christian or whatever.

One of my ex girlfriends was full on Mexican (both parents came from the gdl area), but she was completely white and their last name was "Dan". She checked the Latino box and was never asked about it when she was job hunting.