Members of the Police Department are authorized to enforce the laws applicable to the city, bring violators before the court, and make complaints for offenses coming to their knowledge. Members of the Police Department are authorized to serve processes on behalf of the city and shall serve those notices as may be required by the City Council or other authority. When the city is not a party to the proceedings involved in the process or notice, the officer shall collect the same fees as provided by law. All fees shall be paid into the city treasury.