Drop the Pen! What Every Writer Should Know About Real Police Work: Ten Codes
By David Lane Williams
I recently spoke at a writers' conference in Texas. Those in attendance during my talk were primarily mystery and thriller writers who had lots of questions about authentic police work. One of those questions comes up from time to time: what are “ten-codes,” and how can I interpret them? Truth is, they’re still a mystery to me, even after forty years of practicing, teaching, and writing about first responding and investigations. Let’s give it a try anyway.
Everyone has heard the term “ten-four,” one of the many “ten codes” used in police work, as well as Citizens Band (CB) radio. Ten-codes are still ubiquitous in policing, but I find them archaic. Anyone who spends the money for a scanner to listen in on police chatter is capable of getting and printing off a list of codes. “Ten-four” sounds like a rogue trucker movie in the eighties, and you don’t even have to tack on the “good buddy,” for it to sound hokey. Further, I think there is plenty for a young officer to learn without heaping on a couple of hundred codes to memorize when plain old words do the trick just fine. That said, I’m in the minority on this opinion, so don’t listen too closely to me on this one. Ten-codes are going to be around for a while.
There are certain codes that are standard across the country:
10-4: Everything is okay or I understood what you just said to me.
10-1: I have no idea what you just said. Say it again.
10-6: I’m busy unless you really need me for an emergency
10-20: Where are you? (as in, “What is your ten-twenty,” or just “What’s your twenty”)
10-100: I need to stop and pee, often associated with 10-200
10-200: I need to stop and…you get the idea. I’ve only heard this one over the radio once, during a night shift. A reprimand was issued before sunrise.
For every standardized ten-code, dozens are only used in a specific jurisdiction. In some cities, there is a ten-code for an animal carcass in the roadway, though why the dispatcher can’t just say, “There is an animal carcass in the roadway,” is beyond me. I can almost guarantee you in that scenario that the responding officer would have to stop the car and look up code 10-gobbledeehoozit before he understood he was responding to a dead animal in the street. (And no one is going to get on a public police channel and ask what it means…except maybe that one guy who calls out 10-200.)
Beyond ten-codes, many departments also use systems called “codes” (distinct from ten-codes) and “signals.” This can get really complicated, but you may recognize “Code Three” as the term for responding to an emergency with lights and sirens, as in, “Adam 12, respond Code Three to a robbery in progress at…”
In the first jurisdiction where I worked, we had a code for responding with only lights but no sirens. This was termed “Code Two.” When I moved to a different city, however, the term Code Two meant “intoxicated person.” This resulted in a gaffe on my part one evening after I hit the new streets, during which I called for an ambulance “Code Two” because the person I was trying to help was in a panicked state and didn’t need the extra stress of loud sirens. The dispatchers and other officers listening in interpreted this as me asking for a drunk ambulance crew, which was the subject of relentless teasing for the rest of that night.
I don’t know why there isn’t some standard list, but every town is different. Thus, I don’t want writers to spend much time on this other than to say if it is really important to you, give the agency you’re writing about a call. I bet they’d send you the whole list if you tell them you’re a writer working on a project in their city. This is not top-secret WWII code-breaking stuff. This is some clerk’s version of CB radio-speak made up fifty years ago, now ingrained in that department’s culture.
If you want more, Michael Connelly has a cool list of codes and acronyms on his official website (Police & FBI Acronyms - Extras - Michael Connelly). Most are specific to the California area, but the list could be a fun rabbit hole during your research phase. Regardless, ten-codes are part of police life for the foreseeable future, but I think you’re safe if you use them sparingly or not at all. Your call.
Hope everyone is 10-4 with that.
