A. A state agency shall not enter into a contract with a public officer or employee of the state, with the family of the public officer or employee or with a business in which the public officer or employee or the family of the public officer or employee has a substantial interest unless the public officer or employee has disclosed through public notice the public officer’s or employee’s substantial interest and unless the contract is awarded pursuant to a competitive process; provided that this section does not apply to a contract of official employment with the state. A person negotiating or executing a contract on behalf of a state agency shall exercise due diligence to ensure compliance with the provisions of this section.

B. Unless a public officer or employee has disclosed the public officer’s or employee’s substantial interest through public notice and unless a contract is awarded pursuant to a competitive process, a local government agency shall not enter into a contract with a public officer or employee of that local government agency, with the family of the public officer or employee or with a business in which the public officer or employee or the family of the public officer or employee has a substantial interest.

C. Subsection B of this section does not apply to a contract of official employment with a political subdivision. A person negotiating or executing a contract on behalf of a local government agency shall exercise due diligence to ensure compliance with the provisions of this section.