(1) The competition authority may conduct any investigations and collect any evidence required.
(2) Section 372(1), Sections 376, 377, 378, 380 to 387, 390, 395 to 397, 398(1) and Sections 401, 402, 404, 404a, 406 to 409, 411 to 414 of the German Code of Civil Procedure shall apply mutatis mutandis to the gathering of evidence by inspection, testimony of witnesses and experts; detention may not be imposed. The higher regional court [Oberlandesgericht] shall have jurisdiction over appeals.
(3) The testimony of witnesses should be recorded, and the record signed by the investigating member of the competition authority and, if a recording clerk attends, also by the clerk. The record should indicate the place and the date of the hearing as well as the names of those who conducted it and of the parties.
(4) The record shall be read to the witness or be presented to be read by the witness himself/herself for his/her approval. The approval given shall be recorded and signed by the witness. If the signature is omitted, the reason for this shall be indicated.
(5) The provisions of subsections (3) and (4) shall apply mutatis mutandis to the questioning of experts.
(6) The competition authority may request that the local court [Amtsgericht] administer the oath to witnesses if it considers such an oath to be necessary to obtain truthful testimony. The court shall decide whether the oath is required.