Spot on. I have heard it explained like this ( by Smeets, a Dutch reporter, whom I dislike ) :<p>My recollection:<p>&quot;The riders define &#x27;doping&#x27; as going over the limit of detection. They all use &#x27;forbidden&#x27; substances but below the limits. That is why they can say with a straight face on TV they are &#x27;absolutely clean&#x27;. And two weeks later be caught because of a dosing mistake.&quot;