SECTION 8. DEPARTMENT OF POLICE
   The city manager may appoint a chief of police and such patrolmen and other members of the police force as may be authorized by appropriate ordinance.
   It is the duty of the chief of police and the members of the police force to preserve order in the city; protect the inhabitants and property owners therein from violence, crime, and all criminal acts; prevent the commission of crime, violations of law and of the city ordinances, and perform a general police duty, execute and return all processes, notices, and orders of the city manager, city attorney and city recorder, and all other processes, notices, and orders as provided in this charter, or by ordinances.
   In time of riot or other emergency, the mayor or the city manager shall have power to summon any number of inhabitants to assist the police force.
   Members of the police force, whenever necessary for the purpose of enforcing the ordinances of the city, shall procure the issuance of warrants, and citations, serve the same, and appear in the city courts as prosecutors, relieving complainant citizens, insofar as practicable, of the burden of instituting cases involving the violation of city ordinances, but this section shall not be construed to relieve any person from the duty of appearing in court and testifying in any case.