Minn. Stat. § 174.64
Subd. 1. Commissioner's powers generally.
Some of the functions of the commissioner of transportation, related to motor carriers and common carriers by rail, are quasi-judicial in nature. The commissioner may make investigations and determinations, hold hearings, prescribe rules, and issue orders with respect to the control and conduct of the carrier businesses coming within the commissioner's jurisdiction as authorized by law.
Subd. 2. Specific functions and powers.
(a) To the extent allowed under federal law or regulation, the commissioner shall further hold hearings and issue orders in cases brought on the commissioner's own motion or by a third party in the following areas:
Subd. 3. Subpoena power.
The commissioner shall have subpoena power.
Subd. 4. Petition and hearing.