Also FWIW: only 70 tests over some unspecified (probably multi-year) time period?

Something like this ought to be getting tested at least once a week (on average — in a random distribution, of course) in every airport. That's what big companies do for secret shoppers. If TSA's supposed to be on their game all the time with such supposedly huge risks, surely they should be kept to a higher standard than whether some fast food branch is friendly?