This certainly isn’t a localized tactic. I recall discussion of videographers printing statutes and employing them when threatened about recording police activity in public spaces. The frightening aspect (to me) is that some law enforcement officers genuinely appear to believe that they have authority that they don’t have.
http://www.oregonlive.com/portland/index.ssf/2017/04/gresham...
https://www.aclu.org/news/aclu-portland-police-reach-settlem...
They'd just been almost totally destroyed by a tornado and I happened to be just a little ways away. So, lacking anything better to do, I bought some work clothes and went to help move rubble.
I was leaving the State and decided I'd nap for a few hours. I didn't feel like getting a hotel so I slept in the car. It turns out, I was sleeping in a factory parking lot and the people who came in to open it called the police - or so the cops said. It probably didn't help that I was in manual labor clothing, I'm not white, and I was in a new BMW. I probably looked like a drug dealer. That's still not an excuse.
Not to worry, I didn't let it reflect on the nice people of Kansas. But, after I'd spent a couple of weeks just giving my time to those in need, their cops harassed me and told me that I was banned from their State. I haven't been back but that's just coincidental.
I laughed and pointed out that I'm not a teen and am quite familiar with my rights. They were visibly disappointed and told me that I was kicked out of Kansas and that I'd be arrested if I ever went back to Kansas. I giggled again but left and they followed me to the interstate slipway.