How are 911 calls triaged?

  • What types of 911 calls trigger multi-service responses? Anecdotal information seems to be: all. But this can this be the case? "Marital disturbances" surely don't cause not just police but ambulance and fire trucks to show up, or do they? And the different levels of ambulances (Advanced and basic) seem to be triaged in big cities: they seem to send basic (BLS) when it's a "minor" 911 emergency but if its a disasterous accident, then fully-equipped ambulances (ALS) are sent. Or... do they just send the closest ambulance?


  • Dear cshl-ga; You pose a very good question and I?ll do my best to try and answer it as best I can drawing by my twenty plus years of professional law enforcement experience (five of which were as a 911 Communications Center Supervisor). First and foremost federal and state laws and regulations can impact the decisions made at a 911 Public Safety Answering Point (PSAP) where response activation is concerned. From there one must also observes any pertinent local ordnances if and where they are applicable. Moving down the chain of command a PSAP operates in accordance with local department policy (which varies widely from city to city, state to state and region to region.). There are other factors of course that can determine how responses are calculated. A 911 PSAP has the capability of answering 911 calls (literally) as an emergency phone call ? and that?s it. What basically exists at these PSAP?s is a dedicated telephone switchboard with one or more dedicated lines and one or more trained E911 operators either part-time or around the clock. On the other hand, an enhanced 911 PSAP will have several dedicated switchboard, several lines, several highly operators working around the clock 365 days a year. The automatic number identification (ANI) and automatic location identification (ALI) that typically comes loaded in an enhanced system gives the operator advanced information (and insight) into the problem (where the call is coming from, how to direct personnel to that location, in some cases offering electronic mapping systems, etc). The reason I tell you this is because most ENHANCED systems have a feature that categorizes dozens, if not hundreds, of hypothetical situations and each situation is assigned a basic response plan. For example, at the time the system is installed, the research and planning office (or whoever is in charge of making policy for that department) goes through the scenarios and painstakingly decides how their policy will affect each of the responses. Let me show you a possible short list (I am fictionalizing here merely for explanatory purposes, so don?t interpret this as anyone?s actual policy): Fight ? dispute between neighbors system automatically suggests dispatching 1 officer Fight ? physical altercation system automatically suggests dispatching 2 officers Fight ? weapon involved system automatically suggests dispatching 2 officer, K-9 unit, supervisor Fight ? shots fired system automatically suggests dispatching 3 officers, K-9 unit, supervisor Fight ? man down system automatically suggests dispatching 4 officers, K-9 unit, EMS, supervisor And the list goes on. As you can see (or imagine) the response recommendations for ?fight? calls alone numbers in the 20?s or 30?s depending on how large an area is, how many officers the department employs, how many precincts the city has, and what the population is. Other factors that impact how the system is programmed would be: Typical call volume in the area where the problem exists ? some systems can determine if the area is a ?hot spot? (by comparing recent ?red flag? calls in that area to the current one) and can modify ? or ?upgrade? - the normal response recommendation based on facts such as this. The time of day ? some systems can modify response recommendations because of the time of day, sending more or less personnel during times of darkness, weekends, holidays or days of the week when things are statistically slow or more intense. Progressive severity ? if a situation is automatically presented with a recommendation of a one-officer response suddenly accelerates in intensity (or decelerates in stability, however you prefer to view it) the system might recommend a upgraded response. In the event of a ?Fight ? dispute between neighbors?, for example suddenly accelerates to ?Fight ? physical confrontation?, the system might recommend an immediate upgraded response of ?dispatch 1 additional officer, 1 supervisor, 1 EMS?. These are only a couple of automatic modifications but as you might imagine E911 operators are highly trained to make ?human? decisions as well. These ?recommendations? originating from the system are of no value without a human to interpret them. Operators can intervene at any time and modify a call response as needed; after all it is the operators who are operating the system, not a system operating the operators. Having said that, the response determined by an operator is largely determined by training, policy and logical recommendations from the system according to what is known about a given situation. Clearly a 911 operator?s job is a stressful and complicated one at best. To add to this confusion, each area makes it own determination (through legislation, budget, necessity or cooperative spirit) whether once central PSAP controls all emergency response, or if each agency or jurisdiction has their own PSAP to handle it?s own 911 calls. Believe it or not, just because you make a single, convenient 911, this is no guarantee that the operator doesn?t literally turn around and dial the phone to call two more agencies (fire and EMS for example) and repeat the story to them and get them underway. This is the typical way of the un-enhanced systems which is why it is so important to have an enhanced system if you expect your 911 PSAP to function as rapidly, accurately and efficiently as possible. So, in answer to your question 0 there are many, many hidden factors (even some that I did not mention) which have a direct impact on how a response to a 911 call comes about and the ?triage? as you put it, that takes place. The types of calls that would trigger a multi-agency response are as varied as each department wants them to be according to their own policies, needs and abilities. I know one agency that sends 2 officers, 2 fire trucks, EMS and a wrecker to every motor vehicle accident. While this is clearly overkill in most jurisdictions, this particular agency has these resources at its disposal so it simply uses them. The bottom line is: How an agency responds to a given call depends on dozens and dozens of factors. I hope you find that my research exceeds your expectations. If you have any questions about my research please post a clarification request prior to rating the answer. Otherwise, I welcome your rating and your final comments and I look forward to working with you again in the near future. Thank you for bringing your question to us. Best regards; Tutuzdad ? Google Answers Researcher OTHER INFORMATION SOURCES The information presented is derived directly from 20+ years of professional experience in this field. SEARCH STRATEGY SEARCH ENGINES USED: Google ://www.google.com SEARCH TERMS USED: 911 E911 PSAP ANI ALI RESPONSE POLICY


  • very helpful response, thanks. I've noticed in some states, all 3 agencies are sent. For example, in MD, all 3 agencies respond to a car accident because of a law suit years ago where the state was viewed as negligent in the death of a driver because only police were dispatched. Any feel for how broadly or what percentage in the US is a multi-agency dispatch is sent by a PSAP?


  • No, honestly I really don't have any way of supporting a claim that one method is more prevalent than another. The reason is that each jurisdiction does "their own thing" even in Maryland, while the state may in fact dispatch everyone they have to a scene, a lalrge municipality or a rural county on the dark side of the state may do something totally different simply because they choose to do it that way. Initially, it seems complete to say the three emergency response agencies are POLICE, FIRE and EMS. While this may be true int he very broad generic sense, the facts are exceedingly more complicated that that. Not every jurisdiction has a simple police department made up of officers who exclusively enforce the law. You see, some agencies double up as Fire AND Ambulance. Stil other agencies (called public safety departments, in some jurisdicitions) even TRIPLE-UP and wear THREE hats, acting as police, fire AND ambulance as required. In those instances you get all three on every call that comes up whether you ask for it or not (or whether you even "know" it or not). Finally, virtually every state has addition personnel who frequently respond to emergencies who fall in the subcategores of police, fire and EMS. These incluse coroners, medical examiners, animal control officers, SWAT teams, State park rangers, National Park Rangers, Coast Guard, DEA, FBI, Border patrol, US Marshals, and Homeland Security just to name a few. Yes, it's MUCH more complicated than police, fire and EMS....and NO, there's no way that I know of to estimate what percentage of calls typically get a multi-agency response an ANY state and be able to claim that estimate is even near accurate. I hope this helps. Regards; tutuzdad-ga


  • For what it's worth, PLANT EQUIMENT, INC is one of the major vendors of E911 equipment and controls in the United States. I don't know what statistics (if any) you might get from them, but here's their site if it helps: PLANT EQUIMENT, INC http://www.peinc.com/ My guess is that ou probably won't get much information from them in terms of what each agency typically does in every known situation (too many variables) but I do know that their system comes pre-loaded with some genenric responses which can be modified by an agency to suit their needs and meet their own policy guidelines. How Plant Equipment came to the conslusions that caused them to code these default responses sto some emergencies into their equipment is something you'd defitenly need to ask them. Regards; tutuzdad-ga


  • Clarification: I don't mean to suggest that "ALL" Plant Equipment comes with default responses. When speaking of Plant Equipement's "system" I am referring to the one that I personally know most about, which is the MAARS APU system and software and the ComCentrix unit that works with it. http://www.peinc.com/solutions/public-safety/comcentrex.asp tutuzdad-ga