Looks like approximately 28% of US sports stadiums had 50% or more of their food service outlets incurring at least one major food safety violation during 2017. -Despite the fact that due to security issues and concerns about ticket sales, health inspectors at most of these venues have to make appointments for inspections, they cannot arrive unexpectedly. So, these venues prepared for the inspections.
Here's how individual arenas performed.
Some of the details are not for the faint of heart.