Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 111C, § 17

The parent or guardian of an injured or sick child who is to be transported to a hospital or other medical treatment facility by an ambulance shall be allowed to accompany such child upon such parent's or guardian's request, unless the emergency medical technician in charge determines that the medical situation is life threatening or that the presence of a parent or guardian would create a potential risk to such child. Such determination shall be noted in the written report of said emergency medical technician and a copy of such report shall be sent to such parent or guardian within 30 days of such determination.