I am guessing that every state has specific laws covering volunteer services. A few that are easy to find for NY cover volunteer firefighters:
Workers' Compensation: Volunteer Firefighter NY CLS Vol Fire Ben 6 Firefighter A volunteer firemen who is injured or killed in the line of duty is entitled to workers' compensation. They will not receive workers' compensation if intoxicated or intended to cause the injury or death.
Workers' Compensation: Volunteer Firefighter NY CLS Vol Fire Ben 16 Firefighter A volunteer firefighter injured in the line of duty is entitled to receive medical, surgical, podiatric, chiropractic, psychological, and other treatment. The political subdivision the firefighter was volunteering with is responsible for the expenses of such treatment.
Laws probably exist relating to benefits and protections for career (paid) firefighters, EMTs/Medics and POs who assist off-duty.
Workers' Compensation: Volunteer Firefighter NY CLS Vol Fire Ben 6 Firefighter A volunteer firemen who is injured or killed in the line of duty is entitled to workers' compensation. They will not receive workers' compensation if intoxicated or intended to cause the injury or death.
Workers' Compensation: Volunteer Firefighter NY CLS Vol Fire Ben 16 Firefighter A volunteer firefighter injured in the line of duty is entitled to receive medical, surgical, podiatric, chiropractic, psychological, and other treatment. The political subdivision the firefighter was volunteering with is responsible for the expenses of such treatment.
Laws probably exist relating to benefits and protections for career (paid) firefighters, EMTs/Medics and POs who assist off-duty.