How do you know they're only taking urine?
All baseball players are tested frequently for PEDs. To think that one player could get around those tests is just ludicrous. Everytime a player starts having a good run there are fools out there that want to start rumors to stir things up and other fools that listen to them.
If you want to bad mouth somebody, go after Braun. He tested positive and got off on a technicality.