1. The director of revenue, under rules prescribed by him, may delegate to any political subdivision by cooperative agreement the auditing of records incident to the administration, collection, and operation of any tax imposed by that political subdivision under the authority of the sections set forth in subsection 4 of this section.

2. Once the director of revenue has approved a cooperative agreement made under this section, the state shall pay to each political subdivision which performs an audit in accordance with such agreement the one percent collection fee retained by the state, or an agreed upon portion thereof.

3. The director of revenue shall maintain supervisory control over any such function or functions delegated by cooperative agreement and may require such information, reports, and documents, or the modification or termination of such agreement as may be necessary for the performance of the duties imposed upon the director of revenue.

4. This section shall apply to taxes authorized by sections 66.600 to 66.635, ^*67.500 to 67.545, ^*67.550 to 67.580, ^*67.600 to 67.640, ^*92.400 to 92.420, ^*94.500 to 94.570, and ^*94.600 to 94.655.

5. No audit authorized by this section shall be undertaken by any political subdivision without the specific approval of the director of revenue. All audits so approved shall be conducted at the location where the taxpayer’s records are maintained. The director of revenue may authorize a joint audit by the state and one or more political subdivisions and may use the results of such joint audit for enforcing and collecting both state and local taxes. The director shall not authorize more than one audit of the same taxpayer in any one year under this section.