I can't answer to NYS laws and regulations.
Honestly, if you want the real true correct answer, go here first before relying on what anyone from here tell you:
Bureau of Emergency Medical Services
Central Office
Hedley Park Place
433 River Street
Suite 303
Troy, NY 12180
(518) 402-0996
(518) 402-0985 Fax
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What I can tell you, is that EMS takes paitents to their choice of destination, unless the destination can not recvieve them, or the person can not make the choice. In that case the most appropriate reciving facility is where they are taken. I will be honest, I didn't read the whole post because I don't know your system or how it operates. In our county, we have one hospital that is able to accept psych paitents. They have adequate security, adequate accomidations, and an inpaitent center to transfer them to on campus. All of our psych paitents go there. We really don't have to worry about that not being their choice, because most people in that situation, know that center is what they want checked into.
Hopeully you can call someone in that office and get an answer. Also you might be able to get some common sense answers from the community here.