Who doctored my cheese?

When agents from the U.S. Food and Drug rug Administration paid a surprise visit to a Pennsylvania cheese factory in November 2012, they found evidence that Castle Cheese was doctoring its so-called 100 percent Parmesan with cut-rate substitutes and fillers such as wood pulp. That may sound like a plot from an episode of NYPD Bleu, but adulterated grated Parmesan and Romano cheeses remain a very real problem. �Lydia Mulvany