[RDasher]

"Yep, part of the weirdness that is statistics is concerned with how certain one wants to be that the answer is the correct one. Stopping all the terrorists 99% of the time just isn’t good enough."

The problem is TSA batting average is zero. The number of terrorists detected by TSA = 0, the number arrested = 0, the number convicted = 0.

The number of terrorists detected by passengers on an airplane and missed by TSA = 3 (or similar number)

[FourPeas]

I’m not sure we know what TSA’s track record is. We do know they seem to frisk a lot of people who are highly unlikely to be terrorists.