I have been an Career EMT/FF for several years. Several years before that as a Volunteer. Not sure where you are getting your "general consensus" from about turning over to LEO's. In SE WI, there are a few different Standard Operating Guidelines, all of which are very close to each other. As far as lawful encounters with a licensed person, the weapon is to be transported with the person, secured in a pelican case inside the ambulance which has been tamper proof tagged and the tag number placed on the chain of custody form with a witnessed signature. Local LEO's basically want nothing to do with the chain of custody of a lawful persons firearm. The chain of custody will then be signed for by the hospital, then secured by hospital security staff. As far as EMT's carrying, I know of some places that are allowing it, and some places that are not. Persons carrying unlawful firearms, or firearms disturbance type calls will be handled the same way as before.
http://www.sertacwi.org/SERTAC.html - this organization has comprised some suggested guidelines for legally concealed weapons, not available on their site at this time. But their contact info is there.
Paitients lawfully carrying, but appearing to have an altered level of conciouseness will be handled according to the situation. Basically no different from how I would have handled a call on 10/31/11 as opposed to 11/1/11.