Subpoenas shall be returned directly to court. However, subpoenas on peace officers may be returned, if requested, to the subpoenaing party. The certificate of service must be attached to the original subpoena. The return of a criminal subpoena received for service by telegraph or teletype must be made by telegraph or teletype certifying the actions in making the service. (PC 1328(c))
If the witness named in a criminal subpoena is a peace officer as defined in PC 830 and the service has been made upon the officer’s immediate superior or an agent designated by the superior for service of such process, the certificate of service shall so indicate. The return shall be made to court immediately upon completion of the service. If notified by the immediate superior of the witness that the subpoena was not served, immediately notify the subpoenaing party. (PC 1328(f))