Minn. Stat. § 214.15: TRADE REGULATION.

Notwithstanding any other law to the contrary, members of occupations regulated by the licensing boards may advertise, but advertisements must not be inconsistent with rules relating to advertising format and substance which each board is herewith empowered to adopt if that board had statutory advertising limitations on the effective date of the rules. A board may adopt rules relating to minimum fees, splitting of fees, referral fees, compensation, hours of practice, or other practice limitations, but only if (a) the governor or the board had specific statutory limitations or specific statutory authority to adopt the rules on the effective date of the rules, (b) the rules are not inconsistent with other law and (c) the rules are immediately and directly related to the protection of the safety and well-being of citizens of the state.