Greenwood is charged with possession with intent to distribute a class A substance.
His arraignment is scheduled for Wrentham District Court Monday. The charge carries a potential 10-year prison term. The Norfolk District Attorney's Drug Task Force arrested Greenwood near a Franklin post office after he took possession of 500 10-milliliter vials of Ketamine. The drug, also known as ''Special K,'' is used to drug rape targets. It is associated with so-called ''club drugs'' like Ecstasy.