It may surprise you to learn that actually, no one is ENTITLED to any services. You can say no. Will they sue - sure - will they win? Not unless the city caves - that's very much settled in case law. (If however, you say you are coming, and you don't, that another story.) If you have a well-organized system, use one of the Emergency Medical Dispatch programs available out there, and FOLLOW IT - and deny response (or transport) as a result of it, you are very well protected by law. (In fact, all