It is perhaps the biggest part of cycling - the neverending game between the testers and the dopers. The testers develop better tests and the dopers take less-detectable dope and the cycling cycle continues.
That will undoubtedly be the biggest topic again now that the Tour de France is under way - which riders were booted from the race for booting dope. Maybe, when it's all over, you'll remember who won. Maybe not.
The sport should end the ineffective charade. Cycling should legalize it - all of it, from steroids to growth hormone to blood boosters. Why not? If they're going to cheat anyway - and they are - you might as well have the most talented riders on the course competing for the best chemically enhanced times.