It sounds like they thought it would be out of his system in time, but absolutely knew there was a risk it would not and didn't have the ability to do one last test just before the race to make sure. They basically gambled on it coming back clean and lost.
The issue is whether they should have been allowed to gamble like that to begin with because a positive would be a blow to the reputation of the sport and a "positive horse" could also impact the race.
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