I have experienced the same at #SFO when boarding to Zurich during my last two visits. No possibility to opt-out.
Worse, when I asked for details about the system or a privacy policy, no one at the airport knew what to refer me to.
At least for full body scanners, the TSA has a process in place that they apply without challenging you, when you ask to opt out.
For facial recognition, nada!
Great reporting by @josephcox@infosec.exchange (You should subscribe to 404's RSS feed too!)
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An internal airport email obtained by 404 Media shows CBP is changing how it measures its goals for biometric boarding when people fly out of the U.S.
Leaked Email: CBP Tells Airports Its New Facial Recognition Target is 75% of Passengers Leaving the US
by josephfcox