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Super nitpick: SFO doesn't employ TSA agents. Those were CAS contractors.

Thanks! Never knew that this role was sometimes contracted out.

Wow, I never knew such thing existed. Do you have any idea what makes an airport use CAS over TSA?

I'm sure someone can answer better than I, but SFO picked CAS before TSA was mandatory.

I dimly remember that it's up to each individual airport.