Massachusetts General Laws Part IV. Crimes, Punishments and Proceedings in Criminal Cases (Ch. 263-280) Ch. 263, § 1

Whoever is arrested by virtue of process, or whoever is taken into custody by an officer, has a right to know from the officer who arrests or claims to detain him the true ground on which the arrest is made; and an officer who refuses to answer a question relative to the reason for such arrest, or answers such question untruly, or assigns to the person arrested an untrue reason for the arrest, or neglects upon request to exhibit to the person arrested, or to any other person acting in his behalf, the precept by virtue of which such arrest has been made, shall be punished by a fine of not more than one thousand dollars or by imprisonment for not more than one year.