A report from the USDA finds ground beef in schools contain significantly less salmonella contamination than ground beef sold to consumers. The USDA’s Economic Research Service recently examined the impact of food-safety standards imposed by the Agricultural Marketing Service on suppliers of ground beef to the National School Lunch Program. Because ground beef is a staple of school menus and has suffered a number of product recalls in recent years, A.M.S. pays particular attention to the food safety of ground beef. The researchers found that the food-safety performance of active suppliers exceeded the performance of inactive ones, meaning they sought approval to supply the National School Lunch Program, but did not bid for contracts and commercial market suppliers. The report in that case would suggest that A.M.S. standards encourage superior food safety performance.