I also read that it probably wasn't just a pee test divided into 2 samples, its more comprehensive than that, and he probably failed a series of tests. The last test was likely a sophisticated blood test.
All of those tests have false positive rates, but to coincidentally get a false positive on all of them is 1 in millions lottery type of odds.
<WarMoose> Think about how stupid the average person is. Now realize that half of them are dumber than that.
<Chunda> Why half?