I find it a bit unrealistic. Both the person doing it, and doing it so well, and everyone just going along with it.
His argument is that his tea was dosed with a laxative. Even assuming no trace could be found the facts that the suspect was the one who produced the cheat sheet, slapped his booty, and that he immediately let loose would lend credence to his story.
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It was obvious something was up with the tea. I was thinking something along the lines of alcohol. His erratic behavior, aggression, paranoia, and his spacing out would be seen as effects of being drunk. You could still have him fail the test because of being drunk, if you wanted to include that. Something like that would be more believable and thus enjoyable, imo.
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