List of defunct law enforcement agencies of Massachusetts

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Three of the following defunct Commonwealth of Massachusetts police agencies (Registry of Motor Vehicles Division of Law Enforcement, Massachusetts Capitol Police, Metropolitan District Commission Police) were merged in 1992 by Chapter 412 of the Massachusetts Acts of 1991 along with the former Department of Public Safety - Division of State Police to form the current Department of State Police. All officers of the three departments became Massachusetts State Troopers at the time of the merger without needing to attend the Massachusetts State Police Academy.