This was specifically listed as a summons. Even in places with a normal rules for “filing charges” (requiring a prosecutor), police can often issue summons for

This was specifically listed as a summons. Even in places with a normal rules for “filing charges” (requiring a prosecutor), police can often issue summons for non-arrestable offenses (and sometimes as an alternative to arrest for arrestable offenses). The prosecutor will still have to file charges before the arraignment, but the police may retain the ability to withdraw the summons (and cancel their request to the DA to file charges) unilaterally before that occurs.