Do police officers use codes on their walkie talkies? If not, why don't they just say 'I need backup at this location'? Or does this happen sometimes without being coded as such? -
What's Up With "10-4" And Other Radio Lingo? | Mental Floss
Schüssel Aktivität Verfrüht 10 4 meaning radio Versicherung Egoismus verdreifachen
Police 10 Codes (Ten Codes) for Law Enforcement Radio