This is 1000% not true in NH. Sure, say something vaguely suicidal to an ER doc and once you’re medically cleared you are off to the psych ED. You then get a mental health clinician evaluation - and if there is any concern of imminent harm to self or others an IEA is filled out. The person get a hearing in front of a judge. Involuntary admissions are decided by the NH state court. You can find more info here: https://www.dhhs.nh.gov/about-dhhs/locations-facilities/new-hampshire-hospital/nhh-involuntary-admissions