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My boarding pass has been scanned by a machine with a cat5 coming out the back at DIA, LGA, JFK, ORD, MDW, PHL and DFW this year. This happens at the podium when presenting ID and boarding pass.

Although not directly at the time of scanning video surveillance shouldn't make it too hard to match the records up.

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Yes, but after that, you enter a queue of maybe a dozen people in no specific order to actually go through the scanner.

They could pool results saying "these 10 scans are potentially from these 40 people" and cross reference against every airport visit, but are they that competent?

You don't want to rely on them being incompetent, because you may end up with your hand deep down the toilet when they become smart enough. Now you only rely on incompetence alone, and that is quite easy to change.

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