Mass. Gen. Laws ch. 147, § 16B: Days off for police; one day out of six

Section 16B. Except in Boston, members of the police department of every town which accepts this section by vote of its city council in case of a city or of the town, in case of a town, whether or not section fourteen, fifteen, sixteen or sixteen A has theretofore been operative therein, shall be excused from duty for one day out of every six without loss of pay.