Pretty pathetic that a loophole like that allows him to get off. As for a 20:1 ratio in the sample (as stated in the article), it's pretty damning. The likelihood that it was tampered with is slim to none. If any of you have taken a drug test, you'd know that the sample is supposed to be sealed in front of you, and you have forms to sign which match up with the seal tag on the vial. Overnight storage in a refrigerator will NOT affect the results. The metabolites won't be created, nor destroyed in the sample. As I'm sure most of you know, samples are preserved in refrigeration for years, so overnight before shipping to the testing facility is not an issue at all.
Hopefully the loophole is closed and other cheaters like Braun get the punishment they deserve. Look for a lot of backlash if he has a poor season. As I've seen others state, I'd bet that he'll come up a lot in the "random" testing throughout the year.