For more information on policing in Massachusetts, see entry on Boston Police.
- Partnership/Ownership/Membership – Anti-Defamation League (ADL)
In 2014, Middlesex County Sheriff Peter Koutoujian participated in a “counterterrorism seminar” in Israel, as part of an all-expenses-paid delegation of US law enforcement to Israel sponsored by the New England chapter of the Anti-Defamation League (ADL). The New England Chapter of the Anti-Defamation League (ADL) sponsors annual all-expenses-paid delegations to Israel for high-ranking New England police, ICE, FBI, and other security officials, where these officials meet with Israeli military, police, and intelligence agencies, with whom they train and exchange tactics including surveillance, racial profiling, crowd control, and the containment of protests.
- Partnership/Ownership/Membership – Greater Boston Police Council
The Middlesex County Sheriff's Office is listed as a full member of the Greater Boston Police Council, a "law enforcement council" (LEC) set up in the 1970s to link regional police forces and share resources for policing anti-war protests. LECs in Massachusetts have played a central role in militarizing police by organizing SWAT teams and purchasing military equipment such as Lenco Bearcats and other armored vehicles.
- Partnership/Ownership/Membership – Northeastern Massachusetts Law Enforcement Council (NEMLEC)
The Middlesex County Sheriff's Department is a member agency of the Northeastern Massachusetts Law Enforcement Council (NEMLEC). NEMLEC is a "law enforcement council," which organizes SWAT teams and obtains military equipment for use by local police and other law enforcement agencies, while operating largely out of public view as a semi-private organization.
- Association/Collaboration – Salem State University
The Middlesex Sheriff's Office was listed as an employer "looking to Hire Salem State Vikings" on the Salem State University webpage advertising the university's 2022 Virtual Job and Internship Fair.