Code One. When the control operator fails to receive an acknowledgment of a communication, a "Code One" shall be given. The unit to which a "Code One" is directed shall acknowledge immediately upon hearing a "Code One."

Code Two. A radio call accompanied by a "Code Two" designation is an urgent call and shall be answered immediately. The red light and siren shall not be used, and all traffic laws shall be observed.
Code Three. A radio call accompanied by a "Code Three" designation is an emergency call. It shall be answered immediately, but in a manner which will enable the unit to reach the scene as quickly as possible with safety. Exemption from provisions of the California Vehicle Code (Division 11), section 21055, is granted only when officers sound a siren as reasonably necessary and the officers� vehicle displays a lighted red lamp visible from the front.
Code Four. When additional assistance is not needed at the scene of an "All Units" call, a "Code Four," followed by the location of the call, shall be broadcast. Radio units which are not assigned to the call and which are not at the scene shall return to their assigned patrol area when a "Code Four" is broadcast. Officers shall use discretion and downgrade their responses based on the arrival of other units at the requesting officer�s location or if a �Code Four� is broadcast.

Code Four Adam. When additional assistance is not needed at the scene of an "All Units," call but the suspect is still in the vicinity, a "Code Four Adam," followed by the location of the call, shall be broadcast. This should then be followed by a description of the suspect. Radio units which are not assigned to the call but which are on the way to the scene shall, when a "Code Four Adam" is broadcast, patrol or post themselves at strategic locations near the scene.

Code Five. A unit intending to "stakeout" shall notify the control operator of the location and request a "Code Five." The control operator, upon receipt of the message, shall immediately broadcast that there is a "Code Five" at the particular location. All units shall avoid the vicinity except in an emergency or in response to a call.

Clearing Code Five. When the need for a "Code Five" no longer exists, the originating unit, or the last unit to leave the scene, shall request the control operator to clear the "Code Five" at the particular location.

Code Five Edward. A "Code Five Edward" shall be used to notify Air Support Division (ASD) personnel of an explosive hazard to low-altitude aircraft.  All units shall avoid the vicinity except in an emergency or in a response to a call for service.
Code Six. When a unit is conducting a field investigation and no assistance is anticipated, a "Code Six,� followed by the location, shall be broadcast. A unit shall not go "Code Six" until it arrives at the scene of a call.

Units on "Code Six" status shall remain available for reassignment to priority calls by monitoring their radio frequencies. A unit on "Code Six" status may indicate to the dispatcher additional circumstances which will make the unit unavailable for assignment to a priority call. These circumstances may include:

Suspect in custody;

Primary unit at a crime scene; and/or,

Required at a back‑up, assistance, or help location.

Note: The unit shall notify the dispatcher as soon as it is again available for radio calls.

Code Six Adam. When an officer may need assistance in conducting an investigation, the officer should broadcast "Code Six Adam" with his or her location. Other radio units in the vicinity should then patrol in the general direction of the given location. Officers should not ordinarily leave their assigned districts but should deploy to an advantageous position in the event that assistance is later requested. When a unit broadcasts "Code Six Adam" and later finds that assistance will not be needed, a "Code Four" and the location shall be given without delay.

Code Six Charles. When a one‑officer unit receives a "Code Six Charles" in answer to a request for information on a suspect, the officer shall place himself or herself in a position of advantage over the suspect while awaiting arrival of assistance. When control is obtained, the one‑officer unit may request and receive the want/warrant information from the Radio Telephone Operator (RTO). When a "Code Six Charles" is received by a two‑officer unit, the officers shall immediately place themselves in positions of advantage over the suspect. When control is obtained, the unit shall request the want/warrant information from the RTO.

Code Six George. When an officer may need assistance in conducting an investigation concerning possible gang activity, the officer should broadcast "Code Six George" and the location. An available Gang Enforcement Detail Unit should respond, while other radio units in the vicinity should then patrol in the general direction of the location given. Officers should not ordinarily leave their assigned districts but should deploy to an advantageous position in the event that assistance is later requested. When a unit broadcasts "Code Six George" and later finds that assistance will not be needed, a "Code Four" and the location shall be given without delay.

Code Six Mary. When an officer may need assistance in conducting an investigation concerning possible militant activity, he/she should broadcast "Code Six Mary" with his or her location. Other radio units in the vicinity should then patrol in the general direction of the given location. Officers should not ordinarily leave their assigned districts but should deploy to an advantageous position in the event that assistance is later requested. When a unit broadcasts "Code Six Mary" and later finds that assistance will not be needed, a "Code Four" and the location shall be given without delay.

Code Seven. When a unit desires to go out of service for free time, a request for "Code Seven," accompanied by the location his/her assigned vehicle will be parked, shall be transmitted to the control. The control operator shall instruct the unit to "Stand By" until it can be determined whether the request can be immediately granted. If the request cannot be granted, the control operator shall instruct the unit to "Continue Patrol." If the request is granted, the control operator shall inform the unit "OK for Seven."

Code Eight. This call is broadcast for general information when a fire has been reported at a specific location where there is a high fire hazard or a threat of personal danger to firefighters from hostile groups. Units in the vicinity should respond to the call but remain on the air available for calls unless it is necessary to assist or investigate. "Code Six" shall be used when it is necessary to go off the air.

Code Eight Adam. This call is broadcast when Communications Division has received notification from the Fire Department confirming an active, verified fire at a specific location and the senior officer at the scene has requested additional fire units. A specific police unit shall be assigned the call to assist with traffic or crowd control.

Code Ten. This call is broadcast when a clear frequency is required to check a suspect for wants and/or warrants. When an officer desires a clear frequency to check a suspect for wants and/or warrants, he/she shall:

Determine that the frequency is not in use;

Identify himself/herself with his or her unit number;

Request "Code Ten," and state the number of suspects to be checked; and,

Indicate whether suspects are juveniles.
Code Twelve. An officer who responds to a "Code Thirty," "Code Thirty Adam," "Code Thirty‑Ringer," "Code Thirty Victor," or a 211 silent, and determines that there is no evidence of a burglary or robbery, and it appears that the false alarm was caused by equipment malfunction or subscriber error, shall broadcast "Code Twelve," the address, and firm name, if any.
Code Twenty. When a traffic collision or other event being investigated is of such a spectacular nature or is sufficiently unusual that accounts of it would stimulate general public interest, the phrase "Code Twenty," accompanied by the location of the accident or event, shall be transmitted to the control.

Code Thirty. This call is broadcast for general information when a silent burglar alarm has been reported by an alarm company or by an automatic tape message. Units in the vicinity should respond to the call but remain available for calls unless it is necessary to go "Code Six" for the purpose of assistance or investigation.
Code Thirty Adam. This call is broadcast when a silent burglar alarm has been reported by an alarm company and the location is being monitored audibly. Units in the vicinity should respond to the call but remain available for calls unless it is necessary to go "Code Six" for the purpose of assistance or investigation.
Code Thirty‑Ringer. This call is broadcast when a Communications dispatcher receives information that a ringing burglar alarm has been activated. Units in the vicinity should respond to the call but remain available for calls unless it is necessary to go "Code Six" for the purpose of assistance or investigation.

Code Thirty Victor. This call is broadcast when a visual verification alarm has been activated. Upon receipt of the alarm activation and the display of photographs depicting an intruder, the alarm company will notify Communications Division.  A unit shall be dispatched to respond to the call immediately. Officers responding shall only be interrupted to perform police work of major importance or to respond to a higher priority radio call.
Code Thirty‑Seven. Communications Division Radio Telephone Operators running want/warrant information for field personnel shall broadcast a "Code Thirty‑Seven" when stolen vehicle information is returned on vehicle license numbers. Field personnel shall employ appropriate defensive tactics and/or report pertinent information such as location, direction of travel, vehicle description, until control is assured.
Code Robert-Rifle. When an employee needs a Police Rifle or the employee shall broadcast the unit designation, location, and �Code Robert-Rifle�.

Code Robert-Slug. When an employee needs an Slug Ammunition the employee shall broadcast the unit designation, location, and �Code Robert-Slug

Code Tom. When an employee needs a TASER, the employee shall broadcast the unit designation, location and "Code Tom."

Code 100. This code shall be broadcast by a field unit to notify other units that a possible escape route of a suspect from a crime scene is under temporary surveillance. The term "Code 100" shall be broadcast in the following sequence: Unit identification; "Code 100;" and, the location

 Radio Communication Terms

 AC Aircraft crash
fB Fallen Balloon
 QT Secrecy required regarding location
211 Robbery
311 Indecent exposure
390 Drunk male
390W Drunk female
415 Disturbance
459 Burglary
484 Theft
484PS Purse Snatching
502 Under‑the‑influence driver
507 Minor disturbance
507FC Firecrackers
 586 Illegal parking
586E Car parked in driveway
Roger Message received; will comply
Come In You are being called
Stand By Wait until a suitable answer is determined-or do not transmit
Go Ahead Proceed with your message
Repeat Repeat your message.

 Out of service; not available for call

 (used when no other specific code applies and shall be followed by the reason)

 Clear No calls outstanding against unit; available for call