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4/120, RADIO TERMINOLOGY, CODES AND CRIME BROADCASTS
return to their assigned patrol area when a "Code Four" is broadcast.
*968 ˙ 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 broadcasthat 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.
Officers' Responsibilities. An officer determining that an explosive hazard exists to low-altitude aircraft shall immediately
notify Communications Division of a "Code Five Edward" via telephone or radio.
Note: Radio or Mobil Digital Terminal (MDT) communications may detonate an explosive device˙ All radio or MDT
communications should be made approximately one block (500 feet) away from the "Code Five Edward" location.
The officer shall inform Communications Division of the "Code Five Edward" location, and the area of the established perimeter
(as measured in feet) around the bomb device/explosive hazard.
Note: If personnel from the Explosives Unit, Scientific Investigation Division, determine that the established perimeter is
insufficient for the potential hazard rendered from a suspected explosive device, they shall immediately notify Communications
Division of the expanded perimeter as measured in feet.
A "Code Five Edward" notification shall be made in addition to all the other Department requirements for investigations
involving explosives (4/212.50), when the following circumstances exist:
˙ Incident involving an explosive device which is in an exposed (open air) area or will be moved to an exposed area;
*969 ˙ Incident where the Explosives Unit intends to "render-safe" any explosive item in an exposed area; and,
˙ Incidents involving any explosives (indoors or outdoors) where the explosion could result in blast pressures that may be
  hazardous to aircraft operations˙
Supervisors' Responsibilities. The concerned supervisor shall ensure that Communications Division is notified of any
perimeter adjustment. When the need for a "Code Five Edward" no longer exists, the concerned supervisor shall ensure that
Communications Division is notified to clear the "Code Five Edward."
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Watch Commander, ASD - Responsibilities. Upon notification of the "Code Five Edward" location, the Watch commander,
ASD, shall ensure that deployed Department aircraft are notified of the "Code Five Edward" location and any adjusted perimeter
throughout the incident. The Watch Commander, ASD, shall further ensure that similar broadcasts are provided to media aircraft
in the area.
Note: Department pilots shall determine a safe altitude for any Department aircraft responding to a "Code Five Edward" location
upon notification of any perimeter adjustment.                          a
˙ 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.
*970 ˙ 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 "CRASH" or gang 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˙
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