(a) The commissioner may, subject to the provisions of the Freedom of Information Act, as defined in § 1-200: (1) Make such public or private investigations within or outside of this state as the commissioner deems necessary to determine whether any person has violated, is violating or is about to violate any provision of sections 36b-2 to 36b-34, inclusive, or any regulation or order thereunder, or to aid in the enforcement of said sections or in the prescribing of rules and forms thereunder, (2) require or permit any person to testify, produce a record or file a statement in writing, under oath or otherwise as the commissioner determines, as to all the facts and circumstances concerning the matter to be investigated or about which an action or proceeding is to be instituted, and (3) publish information concerning any violation of said sections or any regulation or order thereunder.

(b) For the purpose of any investigation or proceeding under sections 36b-2 to 36b-34, inclusive, the commissioner or any officer designated by him may administer oaths and affirmations, subpoena witnesses, compel their attendance, take evidence, and require the production of any books, papers, correspondence, memoranda, agreements, or other documents or records which the commissioner deems relevant or material to the inquiry. The commissioner may also issue subpoenas and subpoenas duces tecum in this state at the request of another state if the activities concerning which the information is sought would constitute a basis for an investigation or proceeding under said sections had such activities occurred in this state.

(c) In case of contumacy by, or refusal to obey a subpoena issued to, any person, the superior court for the judicial district of Hartford, upon application by the commissioner, may issue to the person an order requiring him to appear before the commissioner, or the officer designated by him there to produce documentary evidence if so ordered or to give evidence concerning the matter under investigation or in question. Failure to obey the order of the court may be punished by the court as a contempt of court.

(d) No person shall be excused from attending and testifying or from producing any document or record before the commissioner, or in obedience to the subpoena of the commissioner or any officer designated by him, or in any proceeding instituted by the commissioner, on the ground that the testimony or evidence, documentary or otherwise required of him may tend to incriminate him or subject him to a penalty or forfeiture; but no individual may be prosecuted or subjected to any penalty or forfeiture for or on account of any transaction, matter, or thing concerning which he is compelled, after claiming his privilege against self-incrimination, to testify or produce evidence, documentary or otherwise, except that the individual testifying is not exempt from prosecution and punishment for perjury or contempt committed in testifying.