John, you're right that a more detailed analysis of what definition of "black" the drug helps is worthwhile. However, virtually all black ancestry in the US derives from West Africa, which I believe is a fairly well mixed group due to significant movement within the tribes/nations, so the genetic variation is probably no more than amongst white Europeans varying from blond-and-blue-eyed Scandanavians to brown-eyed-and-swarthy Mediterraneans. Checking whether someone is black or not is therefore a reasonable (and cheap!) test in the US.

In Africa though, it'd be a different ballgame!

And as for the article, I still disagree with anything that tries to give an inherent genetic predisposition to "intelligence" (whatever that means), simply because that's made up of far too many elements. If they can identify the elements that cause "intelligence" then they'd have a stronger case, but their theory on Jews is full of holes.

Graham.