New Hampshire's general Good Samaritan law is RSA 508:12, I, Aid at Scene of Emergency or to Victim of Crime. There are several other statutes in New Hampshire that provide similar limited immunity from liability specifically for physicians, medical practitioners, emergency personnel, volunteers and others who, in good faith and without charge, provide emergency services.
RSA 508:12 was easy to find because there's an entry for Good Samaritan in the print index to the statutes. But those other, related statutes that we mentioned above? Not so much. Some are in the index, but we found at least four other statutes that offer limited immunity from liability when providing emergency aid that aren't under "Good Samaritan" - and there are probably more. You'll have to be creative and persistent in your search. Check under Negligence, Emergencies, Emergency Medical Services, and the specific profession or situation you're interested in. Keywords to look for are: "liability," "immunity," "limitation," "negligence," "misconduct," "emergency," and "disaster."
Please remember that this guide is for information purposes only and is not comprehensive. It is intended as a starting point for research, to illustrate the various sources of the law, and to provide guidance in their use. NH Law About ... is not a substitute for the services of an attorney.