Minn. Stat. § 144.4178: CRIMINAL IMMUNITY.

In accordance with section 609.09, subdivision 2, no person shall be excused in an action under sections 144.4171 to 144.4186 from giving testimony or producing any documents, books, records, or correspondence, tending to be self-incriminating; but the testimony or evidence, or other testimony or evidence derived from it, must not be used against the person in any criminal case, except for perjury committed in the testimony.