Minn. Stat. § 16A.012: WARRANTS; DISCOUNTS.

The commissioner of management and budget shall in no case purchase, redeem, or receive any warrant at less than its face value, nor receive any fee or reward for transacting any official duty, other than the salary provided by law. If the public revenue shall suffer loss by reason of the commissioner's failure to call delinquents to account when required to do so by law, the commissioner shall be accountable for all sums due from such delinquents as if the same had been paid.