Mass. Gen. Laws ch. 276 § 100O
A petition for an expungement, any records related to a petition for an expungement, records related to judicial proceedings required to hear the petition for an expungement or an order of expungement pursuant to section 100F, section 100G, section 100H or section 100K shall not be a public record. Any information obtained by a county, municipal or state employee acting in their official capacity and related to a petition for or order for an expungement shall not be a public record as defined by clause twenty-sixth of section 7 of chapter 4 and shall be confidential information. Within 60 days of ordering an expungement pursuant to section 100F, section 100G, section 100H or section 100K the court and the commissioner shall expunge all records of the petition, the order and any related proceedings within their care, custody or control.
Mass. Gen. Laws ch. 276, § 100O