Dekker B-sample positive...
Why bother having it taken? (i guess in case it's mishandled?)
It's standard procedure. If you fail the first test, you can request that they test the second sample. There have been a few instances where the athlete failed the A test, but did not fail the B test; that happened to Marion Jones, a few months before she admitted to doping.
I realize it's standard procedure - it's just a shame that most riders don't have the balls to own up to it, that's all.