Our govenor signed a bill last fall that stated we must run B2 spec diesel fuel.
They ran into problems right away.
Beginning on October 1, 2005, all diesel fuel sold in Minnesota was mandated to contain at least 2% biodiesel. In attempt to prepare for the B2 mandate, over 200 gas stations statewide began selling B2 blends, with some selling blends as high as B20 and B100. Minnesota is the first state to require biodiesel inclusion in pump fuel, but several state governments, including Washington, have biodiesel mandates for their state vehicle fleets. Further, states such as Washington, Illinois, and Oregon have passed sales tax breaks for biodiesel distributors and retailers.
Minnesota temporarilly suspended their B2 mandate for 10 days due to "off spec" soy biodiesel found at the oil refinery. The report onReuters.com is the best I have seen. While we do not have any information as to what the "off spec" issue was, this does reflect the difficulty many producers are having with soy as a feedstock and scaling up to produce large quantities of biodiesel.