Sam Lutfi: Britney Spears OD'd on Amphetamines the Night She Was Committed on a 5150

Britney Spears took a huge amount of amphetamines the night she was strapped to a stretcher and placed on a 5150 hold -- so claims Sam Lutfi's lawyer in the opening statements of his defamation case.Lutfi's lawyer, Joseph Schleimer, told the jury,…