Health hazards from tainted meat, produce and other foods are an ongoing national problem, underscored by last year’s unprecedented infant formula recall. Bill Marler, food safety lawyer and publisher of Food Safety News, will look at why it’s so hard to keep the food supply safe, what the federal government should be doing about it and story ideas for national and local reporters — just in time for summer — that will keep the focus on ensuring the safety of the food we eat.