As a reminder from my previous post about the subject.

Splash and Dash - The process of parking a foreign tanker of biodiesel at a US port, splashing a little diesel so it’s 80/20, receiving a US tax credit for the biodiesel, then dashing off to Europe or somewhere else to sell the biodiesel.

Senate committee aims to close loopholes in biodiesel blending
Members of the U.S. Senate Committee on Finance hope to close a loophole to stop foreign traders of fuel from taking advantage of subsidies earmarked for the biodiesel industry.

Committee members marked up tax policy legislation this week to add to a growing energy act to include protections for the biodiesel industry.

It goes on to say they are trying to get into the upcoming US Energy Act.