On July 2, 2014, EPA issued a final rule outlining the elements of a voluntary third party quality assurance program to ensure the validity of renewable identification numbers (RIN) petroleum refiners use to confirm compliance with the annual fuel standard. Under the final rule, petroleum marketers may choose between two options to verify the validity of RINs generated between February 21, 2013, and December 31, 2014. Importantly, the final rule includes an affirmative defense for anyone except the generator of the RIN for any civil liability for a RIN that has been verified by a third party auditor. The final rule is available online.