There are reports circulating that Britney's positive drug test last week was the result of Provigil, a prescription for treatment of narcolepsy. Well, we're told it ain't so.
In generic drug testing -- the type performed on Britney -- there is not a special screening for Provigil.
In addition, we know the tests actually performed on Spears (until last week) all came back negative, and she had been taking Provigil before that. The plot thickens.