A rookie cop blames the positive drug test that cost him his job on a cup of coca tea.

Alvaro Casado is suing to be reinstated to the NYPD, after he was fired in March for testing positive for cocaine.

Casado contends he innocently ingested cocaine when his girlfriend's mom, Mary Sherman, gave him a cup of coca tea. Intended to relax him, instead it got him canned.

Oh, shoot. I think the same thing is gonna happen to me. I've got a drug test scheduled for tomorrow, and didn't even think when Raoul made me a cup of General Foods Hazelnut Roofie.