Minn. Stat. § 18.82
Subd. 1. Permits.
Except as provided in section 21.74, if a person wants to transport along a public highway materials or equipment containing the propagating parts of weeds designated as noxious by the commissioner, the person must secure a written permit for transportation of the material or equipment from a local weed inspector or county agricultural inspector. Inspectors may issue permits to persons residing or operating within their jurisdiction. If the noxious weed propagating parts are removed from materials and equipment or devitalized before being transported, a permit is not needed.
Subd. 2. Conditions of permit issuance.
The following conditions must be met before a permit under subdivision 1 may be issued:
Subd. 3. Duration of permit; revocation.
A permit under subdivision 1 is valid for up to one year after the date it is issued unless otherwise specified by the weed inspector issuing the permit. The permit may be revoked if a county agricultural inspector or local weed inspector determines that the applicant has not complied with this section.