Minn. Stat. § 12.331
Subd. 1. Authority between political subdivisions.
When the public interest requires it because of an emergency, a political subdivision may request the assistance of another political subdivision. Upon receiving such a request, a political subdivision, called the "sending political subdivision," may go to the assistance of the requesting political subdivision, called the "receiving political subdivision." The receiving political subdivision may accept and use the personnel, equipment, and supplies of the sending political subdivision as agreed upon by both political subdivisions.
Subd. 2. Effect.
Unless there is a written agreement between the political subdivisions establishing the rules for conducting these activities, the provisions of paragraphs (a) to (d) shall apply while the political subdivisions are engaged in the activities described in subdivision 1.
Subd. 3. Retroactive effect.
Notwithstanding other laws this section is effective retroactive to March 29, 1998.