Remedial Radio
Radio codes are used to shorten up the amount of air time on the radio and for situations that are repeated over and over again.
97 being short for 10-97 (Arriving at assigned call in this example).
No one is trying to conceal what they are doing or keep it a secret, just save air time when everyone listening understands what the person transmitting is talking about.
Try this at home, which takes less time? (129 indicating the unit number)
"129 97 on Elm St." or
"129 I am arriving at my assigned call on Elm St." (The remedial English version)
"129 97", would also be common because the dispatcher knows he's on Elm street because he/she sent the unit there.
When 129 reported "129 11-11 Shots Fired" I doubt that anyone (in law emforcement) had to get out a code book.
It is certainly true that 10 and 11 codes differ from city to city and state to state. I actually enjoy listening to different departments across the United States and do so frequently. Two weeks ago I was listening to several counties in Texas; the Arizona Highway Patrol and others. I used to enjoy listening to the Border Patrol, but that has all but disappeared now.
There was an incorrect assumption on my part that if you had an interst in "Breaking News" within Riverside County, California that you would be in Riverside County and consequently know what 11-11 means. (Can you say ASSUME)!
As Brandon pointed out RSO (Riverside Sheriffs Office)
refers to a dead subject as 10-7. In my 40 years of monitoring public safety radio I have NEVER heard any department use 10-7 for "dead".
Burbank, California used to use "10-7 for 10" when they took a coffee break in the 70's; perhaps they still do. They also used "Not Hot" indicating that a vehicle plate returned with no want as opposed to "Negative 29" (English: 29 as is 10-29 meaning there is or is not a want on the vehicle ) Hell, this is fun huh?
Have a GREAT rest of the week!!