Section 63.12 - Investigations; testimonial powers; witnesses(1) Each member of the commission may subpoena witnesses, administer oaths, examine witnesses and compel the production of documents, records, and papers of all sorts in conducting such investigations as the commission may deem necessary or proper in order to ascertain whether or not the provisions of ss. 63.01 to 63.16 are being carried into effect. The commission may examine such public records as it requires in relation to any such investigation. All officers and other persons in the civil service of the county shall attend and testify when required to do so by the commission.(2) In case of the refusal of any person to comply with any subpoena issued hereunder or to testify to any matter regarding which the person may be lawfully interrogated, the circuit court of the county or the judge thereof, on application of any one of the commissioners, shall issue an order requiring such person to comply with such subpoena and to testify, or either, and any failure to obey such order of the court may be punished by the court as a contempt thereof.(3) Each person, not in the civil service of the county, who appears before the commission by its order shall receive for attendance the fees and mileage provided for witnesses in civil actions in courts of record which shall be paid out of the appropriation to the commission. But no witness subpoenaed at the instance of parties other than the commission shall be entitled to witness fees or mileage unless the commission certifies that the testimony of the witness was relevant and material to the matter investigated.