New Mexico

but as a retired nurse (OR) I can tell you this happens more than you want to know. They would rather save you, then have the legal team deal with the blowback, rather than not save you and wind up being sued, fired, losing their licence and possibly facing criminal charges. I've seen Drs/nurses/hospitals get in deep trouble for not doing everything than can to save a patient but never for ignoring a DNR *in an EMERGENCY situation*.
In 2002 I nearly died from ruptured tonsils. I was alone and before the ambulance arrived I stapled my paperwork to my clothes across my chest. In the ER they ripped that shit off and threw it in the floor. Mind you - these were my co-workers! They knew my wishes and they were STILL ignored.
There are no easy answers to this problem. Do the best you can to keep the proper paperwork; on file at the hospital, on file with your lawyer or power of attorney and a copy of the paperwork with you and your next of kin.