126
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.
For a different perspective over in the UK the vast majority of pubs were (are?) members of “Pub Watch.” Every so often the Police would turn up with a photo list for the premises of banned people in your area. It’s worth noting that everyone on the list had been criminally convicted of alcohol related violence and were subject to banning orders.