15-64-111. Information -- confidentiality -- agreements with another state. (1) (a) Except as provided in subsections (2) through (5), in accordance with 15-30-2618 and 15-31-511, it is unlawful for an employee of the department or any other public official or public employee to disclose or otherwise make known information that is disclosed in a return or report required to be filed under this part or information that concerns the affairs of the person making the return and that is acquired from the person's records, officers, or employees in an examination or audit.

(b) This section may not be construed to prohibit the department from publishing statistics if they are classified in a way that does not disclose the identity of a person making a return or the content of any particular report or return. A person violating the provisions of this section is subject to the penalty provided in 15-30-2618 or 15-31-511 for violating the confidentiality of individual income tax or corporate income tax information.

(2) (a) This section may not be construed to prohibit the department from providing information obtained under this part to:

(i) the department of justice or law enforcement to be used for the purpose of investigation and prevention of noncompliance, tax evasion, fraud, and abuse under this part; or

(ii) the department of public health and human services to be used for the purpose of investigation and prevention of noncompliance, fraud, and abuse under the Montana Medical Marijuana Act.

(b) The department may enter into an agreement with the taxing officials of another state for the interpretation and administration of the laws of their state that provide for the collection of a sales tax or use tax in order to promote fair and equitable administration of the laws and to eliminate double taxation.

(c) In order to implement the provisions of this part, the department may furnish information on a reciprocal basis to the taxing officials of another state if the information remains confidential under statutes within the state receiving the information that are similar to this section.

(3) In order to facilitate processing of returns and payment of taxes required by this part, the department may contract with vendors and may disclose data to the vendors. The data disclosed must be administered by the vendor in a manner consistent with this section.

(4) (a) The officers charged with the custody of the reports and returns may not be required to produce them or evidence of anything contained in them in an action or proceeding in a court, except in an action or proceeding:

(i) to which the department is a party under the provisions of this part or any other taxing act; or

(ii) on behalf of a party to any action or proceedings under the provisions of this part or other taxes when the reports or facts shown by the reports are directly involved in the action or proceedings.

(b) The court may require the production of and may admit in evidence only as much of the reports or of the facts shown by the reports as are pertinent to the action or proceedings.

(5) This section may not be construed to limit the investigative authority of the legislative branch, as provided in 5-11-106, 5-12-303, or 5-13-309.