LYNN – A Lynn postal worker was allegedly caught dealing drugs Monday night on Washington Street.The suspect, Tommy P. Sisson, 34, of 14 Heritage Drive, was charged with possession of a class B substance, Percocet, with intent to distribute. He was arraigned Tuesday at Lynn District Court by Judge Dunbar Livingston and was released on personal recognizance. He is due back in court for a pre-trial hearing on Jan. 11.According to court records, members of the Special Investigation Unit (SIU) of the Lynn Police saw a car pull over and block the driveway of a house on Washington Street. After running the plate, officers saw the driver walk out of a rooming house next door and then briefly get into a Cadillac Escalade before he walked back toward the car blocking the driveway.At that point, police approached the suspect, Sisson, who said he stopped by the house to bring his friend a roast beef sandwich and left after his friend ate it. During the conversation, an officer illuminated the inside of his vehicle with a flashlight and saw a sandwich bag with blue pills inside of it.After being placed under arrest, Sisson allegedly said the pills were “perks,” meaning Percocet pills. A notebook was also found on the car seat, which police say contained names and numbers consistent with drug sales. Sisson, who was found to have a huge wad of cash in his front pant pocket totaling $831, alleged that the notebook was used for gambling.When police spoke with the man who Sisson said brought him a sandwich, he admitted that he works with him at the main branch of the Lynn Post Office and added that he didn’t bring him a roast beef sandwich, but rather a McRib from McDonald’s.During Sisson’s booking, police counted 39 Percocet pills that were in his possession and seized his cellular phone.