In this video of the Olympic 400 hurdle final, you can see Ducos hook 3 hurdles in a row (from the 17 second mark until the 25 second mark). Ducos was DQ'd for hooking the hurdles at the NCAA meet. (His left foot goes around the side of the hurdle, instead of over it). He should have also been DQ'd at the Olympics (he got 4th). He is French though...