As we first reported, a source connected to Britney first said Provigil, a drug used to treat narcolepsy, was the cause of the false positive. But then TMZ reported that Provigil would not show up on a court-ordered drug test. Then Brit's peeps said the reason for the positive reading was that she has asthma, and used an inhaler of Albuterol. But then we reported the drug Brit tested positive for was an amphetamine -- and Albuterol is not. So now -- Atttention Deficit Disorder -- just like Paris. And based on our information -- just like Paris -- we believe Britney's prescription is for Adderall. That drug fits the bill, because Adderall is an amphetamine.