Now that amphetamines allegedly have shown up on her recent drug test, Britney Spears plans to argue that a prescription inhaler is in fact to blame for the reading. While TMZ acknowledges that its source for the scoop has twice changed the name of the medication Brit supposedly is taking, it also points out that regardless of the switcheroo, neither of the medications mentioned would have presented a false positive. In other words, the "I did inhale" defense might not stick. - Ben Katner