А може и да няма нищо общо.
Извадка от полицейско ръководство, намерено за 5 минути в google:
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."
Но тъй като това е полиция, сигурно няма връзка.
Може пък да е просто "код седем".