Minn. Stat. § 375.75: RULES AND REGULATIONS.

The county board shall adopt rules and regulations as necessary to carry out sections 375.72 to 375.76 and file them with the county auditor. The board may authorize any county office, department or agency designated by it to purchase supplies, materials, equipment or contractual services in the open market for immediate delivery in emergencies. It shall define emergencies and designate the manner in which these purchases shall be made and reported to the director of purchasing.