Photography is one that comes into play a bit (taking photos in public places). There was a Georgia police chief who gave a press conference on the steps of a courthouse having just lost a civil rights case: his officers arrested a photographer and just kept doubling down. His conference had this marquee quote: "We cannot expect our police officers to be constitutional lawyers or know every minute detail".

"We can arrest you even though we're not really sure if you actually broke a law. You, on the other hand, are expected to know the law, and ignorance is not considered an excuse."