30. The Commission may at any time during an inquiry order a sitting held in camera if it considers it in the public interest.
Moreover, in an inquiry contemplated in the second paragraph of section 20, it may, when it considers it necessary, order a private hearing of a witness and exclude every other person from the place of hearing. The testimony given in that case shall be confidential subject to the discretion of the Commission to use for its report the information so obtained, which shall not however be connected with the witness so heard.