The detention barn is good because it prevents guys from giving anything to the horse within 6 hours (or however long they have to stay in the detention barn for) of the race. Most of the undetectable drugs that the cheaters give the horses were usually given to the horse a few hours before the race. So at least the test barn prevents this from happening.
Unfortunately some of the more sophisticated cheaters have stuff that is so strong that it does not have to be admisitered within a few hours of the race.
So the bottom line is that the detention barn stops your average cheater but it doesn't stop your really sophisticated cheater that has drugs that don't need to be administered within a few hours of the race.
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