Mass. Gen. Laws ch. 268, § 5: Presumption of perjury; papers, books and documents detained for prosecution

Section 5. If perjury is reasonably presumed, as aforesaid, papers, books or documents which have been produced and are considered necessary to be used on a prosecution for such perjury may by order of the court be detained from the person who produces them so long as may be necessary for their use in such prosecution.