‘It is only natural!’ defense

I find the defense of cyclist Floyd Landis against doping charges stupefying. He claims that his blood is naturally high in testosterone. It was just a coincidence that the officials of the race noted this increase in testosterone level after he performed unbelievably well in a crucial phase of the race! I am now waiting for actor Mel Gibson, who was arrested today on DUI charges, to claim that the alcohol content in his blood is naturally high also!