"CSI" star Gary Dourdan no longer faces a drug possession charge after his arrest back in June ... when cops claim they found OxyContin pills -- aka "Hillbilly Heroin" -- on the actor.
Law enforcement sources tell TMZ, prosecutors dropped the charge for oxy possession earlier this week in light of new evidence -- but Gary's drug paraphernalia charge still stands.
As we previously reported, Gary got into a MASSIVE accident before he was arrested -- plowing his SUV into a parked truck.
Gary's due back in court next month for the paraphernalia charge.
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