Minn. Stat. § 151.211

All prescriptions dispensed shall be kept on file at the location in which such dispensing occurred for a period of at least two years. No prescription shall be refilled except with the written or verbal consent of the prescriber. The date of such refill must be recorded and initialed upon the original prescription or within the electronically maintained record of the original prescription by the pharmacist, pharmacist intern, or practitioner who refills the prescription.