A 41-year-old Dunkirk man is facing charges after he allegedly sold quantities of heroin to agents of the Southern Tier Regional Drug Task Force in the city. Dunkirk Police and the Task Force picked up Raymond Santiago Rodriguez last night, charging him with criminal sale of a controlled substance in the 3rd and criminal possession of a controlled substance in the 3rd degree. Rodriguez is being held in the city lock up before he is arraigned in Dunkirk City Court.