I. Any fire company not organized according to RSA 154:1 shall be deemed to be a private firefighting unit.
II. No municipality or other political subdivision shall contract with any private firefighting unit, or furnish financial support, property or equipment to such unit, unless such unit has been certified by the state fire marshal pursuant to RSA 153:4-a.
III. No member of any private firefighting unit shall exercise the legal powers and authorities of the fire department, firefighters, fire chief, or fire officer in charge, as set forth under this chapter and RSA 153:14, unless such unit has been certified by the state fire marshal pursuant to RSA 153:4-a.