DNAInfo Chicago: Is Your Favorite Restaurant Making You Sick? Site Tracks Foodborne Illness. “Dining Grades converts data from public health inspection scores into a letter grade system. Users can view restaurants and their safety records on a searchable map. Because food inspection rating systems differ across state lines, Dr. Harlan Stueven said he wanted to create a consistent rating scheme using pure, unbiased data.” Does not have all cities yet and is at this writing running a bit slowly.