"(CNN) - Ask Douglas Powell, food safety expert and keeper of Barfblog, whether he'd consider a salad of fresh romaine for dinner tonight. If it's lettuce from a grocery store, Powell's answer is yes.
He bought some Wednesday, the day the Centers for Disease Control and Prevention expanded to four states a current outbreak of potentially deadly food-borne illness linked to tainted lettuce. But would Powell put the green stuff on his plate at a salad bar? Absolutely not..."