Discussion

More drug test drama

Updated: February 4, 2009, 1:11 PM ET
By Rob Neyer

So, why did Barry Bonds' urine test come up negative the first time but positive the second?

Here's Will Carroll:

Simple. THG wasn't known at the time. Drug testing works like a mug book on Law & Order. The witness flips through a book and when they see the face, they point. If the picture isn't there, they won't find it. Drug tests look for drugs they know and have the chemical profile for. (It's more technical than this, but that's the basic metaphor.) Since THG was unknown ...

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