Any peace officer, emergency medical technician, firefighter, ambulance attendant, physician, employee of the Division, administrator or staff of a treatment facility, or other person acting under their supervision or assisting them, as well as the entities that may employ or direct the foregoing, acting or omitting to act within this chapter shall not be subject to any civil claim or civil legal proceeding of any nature, in law or equity, for damages of any nature or for any harm resulting from any act or proceeding, decision or determination undertaken, performed or recommended unless such harm was intentionally or recklessly caused by the misconduct of the foregoing individuals.