i haven't been around here much. but i came across this http://www.herald-review.com/articles/2007/03/01/news/local_news/1021491.txt.it doesn't say how they got caught. i'm guessing somebody was jealous and turned them in.
theres a second part of that story where they went to congress and are working on getting a bill passed that would make WVO untaxable for personal use
From my understanding, biodiesel is taxed at the same rate as petroleum based diesel fuel in the US, but on the federal level, homebrewers have an exemption on fed. taxes up to 440 gallons/quarter,
...snip.
The investigators spotted Teixeira's passing bumper sticker: "Powered by 100% vegetable oil."