Dwain Chambers is a drugs cheat. This has to be taken into account when considering his times. For the record Britain has had four gold medalists at 100 metres. Reggie Walker, Harold Abrahams, Alan Wells and Linford Christie. 3 of them are white and the only black runner, Linford Christie, was found to be a drugs cheat. Although he wasn't done for taking drugs when he won his gold, I think it's fair to assume he probably was doing it then and was lucky to get away with. So was he a great sprinter because he was black or because he was a drugs cheat? In fact, many of the great sprinters of the past 20 years have been drugs cheats. Ben Johnson, Carl Lewis, Justin Gatlin. They are also black. Could a factor in the dominance of black sprinters also be attributed to the fact that many of them took performance enhancing drugs rather then some physical difference to white sprinters?