NOBODY is genetically pure, ESPECIALLY "black" people.
Current federal government policy is that employees cannot challenge an individual on what race or sex they claim to be no matter what their appearance.
In their whacko, leftist, politically correct eyes you are now what you claim to be, not what you look like, act like or what other information may be on other documents.
This is supposed to somehow protect minorities, homos. transexuals, etc. but it opens the door for all kinds of manipulation and some downright funny stuff.