I went to a sports school, trained with elite athletes, competed in Athletics for over 10 years, my coach was the Commonwealth Games Sprint Coach in Melbourne 2006! So I know the difference between elite technique and steroids. Bolt is obviously using steroids because you can see it in his arm angle in relation to his ankle cant. It's very apparent.
Besides, which other athlete can run a world record time and still be able to just "jog" the last 10m of their race? Oh, that's right. Asafa Powel, remember him? Trained by the same coach that trains Usain Bolt.
They both do the EXACT same thing and still manage to break the record like that with ease over the line looking around themselves and all over the place.
I went on the track just after the commonwealth games in 2006 to see if I could increase my speed whilst hitting the last 10m (When doing the typical i'll slow down and act cool about it), I did EVERYTHING just to see if that would SOMEHOW improve my performance, but none of it worked out. It only made me slower and basically made me fall off balance that I had to realign myself on the track.
Besides, BEFORE the 2006 Commonwealth Games, I had NEVER heard of Usain Bolt EVER. Seriously, I just randomly heard some dark dude broke the world record without any previous news coverage / internet based results come forth.
Remember Marian Jones? She broke numerous records and about 4 or 5 years later she comes out and says yeah i'm on drugs..sorry.
Regardless, I think he's on something. I'm not saying this because he's fast and he broke a world record and that i'm jealous of him...i'm saying it as a professional / technique based theory.