Good for Ryan Braun. While MLB needs to enforce its drug policy, their contractor also needs to provide a proper evidentiary chain so there can be no contamination of the samples. In the case of Braun, there was sufficient concern over the handling of the sample --- to the extent that the arbitrator gave the player the benefit of the doubt.
I understand MLB is 'livid'. However, they can't have it both ways. They can't discipline a player for (what might have been) breaking the rules while failing to follow their own rules.