Minn. Stat. § 10.43: TELEPHONE USE; APPROVAL.

(a) Each representative, senator, constitutional officer, judge, and head of a state department or agency shall sign the person's monthly long-distance telephone bills paid by the state as evidence of the person's approval of each bill. This signature requirement does not apply to a month in which the person's long-distance phone bill paid by the state is less than $5.

(b) Even if the monthly long-distance phone bill paid by the state for a person subject to this section is less than $5, the person is responsible for paying that portion of the bill that does not relate to state business. As provided in section 10.46, long-distance telephone bills paid by the state are public data, regardless of the amount of the bills.