A story from Bloomberg begins: The Biden administration is following the paper trails of some biodiesel producers amid heightened concern the fuels are at times being made with deceptive ingredients that violate federal law. The action by the Environmental Protection Agency comes as farm groups and a growing number of lawmakers press the government to address worries that used cooking oil, or UCO — a valuable ingredient for making renewable fuels - could be fraudulent. The audits seek to track the source of UCO, with at least two probes nearing completion and others expected to start soon, according to people familiar with the matter. Reuters earlier reported the EPA probes. --------------- The problem is palm oil. Palm oil is one of the world's most frequently employed vegetable oils. It ends up (sometimes after the recycling of its original use as a culinary oil, hence the term UCO above) as a component in biodiesel, a fuel on which many hopes for a sustainabl...