Massachusetts General Laws Part IV. Crimes, Punishments and Proceedings in Criminal Cases (Ch. 263-280) Ch. 263A, § 10

Nothing in this section shall be construed as creating a right, entitlement or cause of action on behalf of any person against any public employee, public agency, the commonwealth, or any agency responsible for the provision of services set forth in this chapter. The commonwealth, its officers and employees, and law enforcement personnel shall have immunity from suit based on any decision, act or omission related to this chapter.