Massachusetts General Laws Part IV. Crimes, Punishments and Proceedings in Criminal Cases (Ch. 263-280) Ch. 276, § 52A

Persons held in jail for trial may, with the approval of the district attorney, and shall, by order of a justice of the superior court, be removed by the commissioner of correction to a jail in another county, and said commissioner shall, at the request of the district attorney, cause them to be returned to the jail whence they were removed. In addition, such persons, if they have been previously incarcerated in a correctional institution of the commonwealth under sentence for a felony, may, with the approval of the district attorney, be removed by the commissioner of correction to a correctional institution of the commonwealth, and said commissioner shall, at the request of the district attorney, cause them to be returned to the jail where they were awaiting trial. The proceedings for such removals shall be the same as for the removal of prisoners from one jail or house of correction to another. The cost of support of a person so removed and of the removals shall be paid by the county whence he is originally removed.