Minn. Stat. § 349.2124: SALES TO INDIAN TRIBES.

A distributor may set aside that part of the distributor's stock necessary for the conduct of business in making sales to the established governing body of any Indian tribe recognized by the United States Department of Interior. A distributor shall, when shipping or delivering any stock to an Indian tribal organization, make a true duplicate invoice showing the complete details of the sale or delivery and shall keep the duplicate.