Duh! Of course you can use drugs to get strong without getting big - what do you think marathon runners use them for? Sprinters have to build short muscle fibre - which is bulky - and they use steroids to help them do it. There's a reason sprinters are huge when distance runners are stringy.
And ffs! Women can't build as much muscle as men, but Marion Jones was bigger than Usain Bolt.
I work with a biochemist who used to work in drug-testing. He reckons you can be 99% sure about a sprinter on the basis of physique alone. He told me Linford Christie was a cheat long before it came out. I didn't realise it was that simple before I met him - but he says it is. Bolt does not have the thighs of a body-builder.
So we're back to the: "paedophiles have goatees" argument.
Well, that one's been dealt with. You'll have to come up with something better, I'm afraid.