Mass. Gen. Laws ch. 166A, § 17: Visitation, examination, subpoena, and oath administering powers of department

Section 17. The department or its employees may visit the places of business and other premises and examine the records and facilities of all CATV companies to ascertain if all rules and regulations and orders of the department have been complied with, and any cases of non-compliance shall be reported by it to the issuing authority. The department shall also have the power to issue subpoenas to compel the attendance of witnesses and the production of documents, papers, books, records, and other evidence before it in any matter over which it has jurisdiction, control or supervision. The department shall have the power to administer oaths and affirmations to persons whose testimony is required.