Geneticists and psychometricians are generally just as leftist as any other scientists, or at least start off that way.
So for at least six decades fame, fortune and acclaim has awaited the psychometrician who develops a method of testing that demonstrates no difference in intelligence between blacks and whites in America. You can bet your bottom dollar extensive attempts have been made to do so.
That every test they come up with just demonstrates the same old one standard deviation, or about 15 IQ points, difference is IMO the greatest possible proof that it exists. Even those trying to demonstrate that it doesn’t exist keep proving it does.
It is ironic that the same people that accept that, in general, whites don’t jump (or sprint) as well as blacks will not accept that blacks, in general, may not think as well as whites.
(Those are generalizations and it doesn’t mean that there aren’t some whites who can jump very well and some blacks who think very well)
My prediction:
Any discussion of racial differences at ALL will be considered the equivalent of promoting pedophilia or distributing kiddie porn- that is even talking about it in any way other than absolute condemnation will result in being a thought criminal and outcast for the rest of your life.