Mass. Gen. Laws ch. 277, § 3: Drawing and summoning of grand jurors

Section 3. Grand jurors shall be drawn, summoned and returned in the same manner as traverse jurors; and, if drawn at the same time with traverse jurors, the number of persons required whose names are first drawn shall be returned as grand jurors, and those whose names are afterward drawn shall be returned as traverse jurors. In Middlesex county, the selection and management of grand jurors shall be governed by chapter two hundred and thirty-four A and other applicable provisions of the General Laws.