Where did you get the information that SFO doesn't use TSA?
From their website:
Covenant Aviation Security, a private company under contract with the Transportation Security Administration (TSA), provides passenger and baggage screening at SFO.
Visit Covenant Aviation Security to learn more about security screening at SFO.
https://www.flysfo.com/about/airport-operations/safety-secur...
More coverage here: https://www.npr.org/2026/03/26/nx-s1-5759273/not-all-airport...
> The Screening Partnership Program contracts security screening services at commercial airports to qualified private companies.