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Why do these Castro gay bars have TSA-style face scanners?
(sf.gazetteer.co)
This is a most excellent place for technology news and articles.
Most of the clubs in my city have used this type of system for over 15 years. It's billed as a way to keep known gang members and people who have assaulted others from the establishments that use the system.
Definitely has a different connotation of surveillance now than when I was out partying at places with it.