Massachusetts General Laws Part IV. Crimes, Punishments and Proceedings in Criminal Cases (Ch. 263-280) Ch. 266, § 100

Whoever willfully, maliciously or wantonly writes upon, injures, defaces, tears, cuts, mutilates or destroys any library material or property, shall make restitution in full replacement value of the library materials or property, and, in addition, shall be punished by imprisonment in a house of correction for not more than two years or by a fine of not less than one hundred nor more than one thousand dollars, or both.

A law enforcement officer may arrest without warrant any person he has probable cause to believe has violated the provisions of section ninety-nine A and this section. The statement of an employee or agent of the library, eighteen years of age or older, that a person has violated the provisions of said section ninety-nine A and this section shall constitute probable cause for arrest by a law enforcement officer authorized to make an arrest in such jurisdiction. The activation of an electronic anti-theft device shall constitute probable cause for believing that a person has violated the provisions of this section.

A library shall prepare posters to be displayed therein in a conspicuous place. Said posters shall contain a summary and explanation of said section ninety-nine A and this section.