To carry on with ideas like
https://en.wikipedia.org/wiki/...
Law-enforcer misuse of driver database soars (January 22, 2013)
http://articles.orlandosentine...
Thats some history and local news. What the mil and federal districts around the US are seeking is a near instant facial recognition system as a person walks down a street.
Has police contact been made before? What was the result? A US or international tourist looking at a WW1 memorial in a city moves their camera around?
A nice approach that can escalate to an ID demand and friendly chat down.
A social media film crew? Local media students? Social media citizens looking to do a "First amendment test" and post the resulting talk down on their blog or site?
A larger approach that can escalate to a talk down with enough law enforcement officials to walk around and find the "citizen journalists" car.
That is why a near instant facial recognition system is so important. Expert local law enforcement officials can be tasked to the person with a camera and then shape the local optics. From friendly to very direct.
The passports in and passports out would be a nice idea too.
The US seems to have no real desire to go back to Operation Intercept
https://en.wikipedia.org/wiki/... and having secure boarders again.