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UPDATE: An interested reader pointed out that in 2009 Josh Barnett chose the time & place of his urine test himself and that it was not a random test but was instead scheduled 48 hours in advance.
UPDATE to the UPDATE: Did a little bit more digging and here's what then CSAC Asst. Executive Officer Bill Douglas told Ariel Helwani at the time:
One of the reasons why it was done so early ahead of time for the bout was one: it was largely an unannounced test. I mean, essentially when the decision was made, Josh had 48 hours to appear to go ahead and take the test; and two: taking the processing times into account, knowing that if sample one comes back with a positive result, and this is how it would be for anybody, it's going to result in action. So, the probability is low that it's going to be done in time.
So I pretty much stand by what I said in the video.