Transit Police officers assigned to Area 1 were conducting fare evasion enforcement at Downtown Crossing MBTA station today. While there officers observed Michael Greene, 33, of Quincy, MA. fare evade by "piggybacking" in behind a paying patron. Officers stopped Greene and a further investigation revealed an arrest warrant in existence for Greene's arrest for violation of the Commonwealth's drug laws. Greene was placed into custody and transported to Transit Police HQ for the warrant and also issued a citation for fare evasion.