09/20/2010 04:41 pm ET | Updated May 25, 2011

Lindsay Lohan's Second Failed Drug Test: Amphetamines

We broke the story ... Lindsay failed two drug tests -- One for cocaine, and now we know the second was for amphetamines.

Our sources would not divulge the nature of the amphetamines, but Adderall -- the drug Lindsay was prescribed and hooked on -- is an amphetamine.

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