Dec 24, 2020 DOL Finalizes Prohibited Transaction Exemption for Investment Advice On December 15, 2020, the DOL issued the finalized prohibited transaction exemption 2020-02 for investment advice. As background, the DOL issued a final rule providing an amended fiduciary conflict of interest rule back in June 2020. At that time, the DOL also proposed this class exemption to go along with that final rule.