Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 41, § 98H

An agreement by a law enforcement agency, as defined in section 1 of chapter 6E, to settle a complaint of professional misconduct by a law enforcement officer, as defined in said section 1 of said chapter 6E, shall not include a nondisclosure, non-disparagement or other similar clause in a settlement agreement between the law enforcement agency and a complainant unless the complainant requests such provision in writing.