"The ethanol industry must be wondering where the bottom is. Profits are slim or non-existent and about 20 percent of all U.S. plants are shut down. In addition, ethanol's main by-product, which is sold as livestock feed, has raised potential food safety concerns. Several studies have linked the by-product known as distillers grain to elevated rates of E coli in cattle And now, distillers grain is facing further scrutiny because the Food and Drug Administration has found that it often contains antibiotics leftover from making ethanol." Mark Steil reports for Minnesota Public Radio March 24, 2009.