Mass. Gen. Laws ch. 233, § 13: Penalty for nonattendance outside state

Section 13. If the person on whom such summons is served is paid or tendered double the fees allowed by law for travel and attendance of witnesses in the supreme judicial court, and double traveling expenses for the whole distance out and home by the ordinary traveled route, he shall, if he neglects without good cause to attend as a witness at the court named in such summons, forfeit not more than three hundred dollars.