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I think that al Zarooni didn't act alone; that's certain because two employees, under him, were referred to in the hearing but there must be more than those in the know and acting, surely. The impression I get is that he, as the second, the junior, trainer at Godolphin, felt he was under great pressure to produce results. He could take advantage of our, and France's and America's winter; a lot of his charges are sent to Dubai in that time, though not necessarily raced then. I suspect that this random test took him completely by surprise; it's fairly rare to test animals when they are not actually racing, and this test was the result of "information". And the test was only of 45 out of 150 to 200 but showed positives in a quarter of those tested. By that reckoning, maybe 50 would have still shown positives then and possibly more would have at other times, given the disappearance rate of the drugs.
I'm sure that his employer had no idea of any of this. He's an owner of the utmost probity.