ESPN's Outside the Lines reviewed and collected more than 16,000 food-safety inspection reports from health departments that monitor the 111 professional football, baseball, basketball and hockey facilities across North America. The review of routine inspection reports from 2016 and 2017 found that at about 28 percent of the venues, half or more of the food service outlets incurred a high-level violation -- one that poses a potential threat for foodborne illness. Outside the Lines also calculated the average number of high-level violations per inspection at each venue, and compared that to the average for restaurants and other food outlets in the surrounding area, for the 82 venues for which we had community data provided by Hazel Analytics.