Authorities say the raid is the result of a three month investigation into drug activity at a residence on Henderson Lane.
Maine Drug Agents along with Penobscot County Sheriff's Deputies and Old Town Police moved in Wednesday.
They say they found thirty grams of heroin and 50 grams of cocaine base.
They also found cash, a pistol and other evidence of drug trafficking.
45 year old Olivia Dunn has been arrested and charged with selling heroin and crack cocaine.
officials say additional arrests are likely.