They turned Chris Hoy into a pincushion
just to make sure he wasn't cheating. He wasn't. Nor has any other British athlete been doping, if we accept the frequent tests as genuine. Poor old Michael Phelps has had people following him into the loo with buckets just to make sure he wasn't cheating either (thank God he eats and drinks as much as he does, otherwise he'd have no bodily fluids left).
All these athletes abided by the rules. It's a piss-take to somehow exempt the Chinese because they're hosting the Games.