La. Public Health and Safety § 40:925
All municipalities, within their corporate limits, and parishes, outside such limits, shall have the power and authority by ordinance or otherwise to set up standards concerning all milk and milk products sold within their respective jurisdictions higher than the standards prescribed heretofore in this Subpart, and such municipalities and parishes shall have the power and authority to revoke or cancel the permit or license of any person, firm, or corporation doing business within their respective limits who violates any of the provisions of this Subpart, or ordinance, or rule or regulation, or order prescribed by said municipalities or parishes. No rules and regulations shall be promulgated by the department denying any municipality or parish the power and authority provided for in this Section.
La. Public Health and Safety § 40:925