Minn. Stat. § 15.55

A sending agency in this state may, in accordance with the travel rules of such agency, pay the travel expenses of employees assigned to a receiving agency on either a detail or leave basis, but shall not pay the travel expenses of such employees incurred in connection with their work assignments at the receiving agency. During the period of assignment, the sending agency may pay a per diem allowance to the employee on assignment or detail. Such per diem allowance shall be in lieu of, but not to exceed, the travel expense allowable under the plan adopted by the commissioner of management and budget pursuant to section 43A.18, subdivision 2 .