What's very odd about Jamaica is that they have "gained" from a number of US and ex-USSR coaches who were scouting and based there. Also the US Collegiate circuit is rife with drug abuse and most of the West Indians end up there. It's a hazy memory but I remember from Michelle DeBruin's autobiography and her shock at the amount of substance abuse in the US athletics circuit. I'm very cautious about Usain Bolt as it is the classical car crash. He's running faster than Ben Johnson.