A more athlete-sided report (tragic tale of 5+ athletes caught out by some supplement/product that should not have had any banned substances in it):
http://www.independent.co.uk/sport/g...s-8708278.html
Although I am willing to be tested anytime, and have been in-competition, I am pretty happy I'm not fast enough to be in full-time testing. If you go along with the IAAF spiel I'd be better off eating nothing but the organic sheep growing in sight of my house, and gather some wild leaves.. Anything else might be contaminated. IIRC, the IAAF strangely seem to suggest the use of sugar drinks for recovery, with which I completely disagree. I'd be lost (ill) without my recovery products, although all too often they have some weird additive I could do without.
On the other side, the 'top sports nutritionists' continually try to develop new supplements, and would use them until the day they are officially banned.
The whole paranoia/suspicion/contamination worry must take a lot of the fun out of being amongst the best in the world.