In Massachusetts, a prison guard has been sentenced to prison. Mark O'Brien, a guard at the Middlesex House of Correction in Billerica, got eight months in the Big House after admitting trying to smuggle heroin to inmates in exchange for Oxycontin tablets. O'Brien conspired with inmate Russell Chiary to swap smuggled smack for Oxycontin, but the person he thought was a heroin supplier was actually a civilian snitch working for the DEA. O'Brien was arrested in March 2003 after meeting with an undercover officer posing as the dealer and accepting heroin from him. While former prison guard O'Brien got eight months, inmate Chiary got eight years for his role in the scheme.