Can they take your tape as evidence? Absolutely.
Absolutely not. The only thing that's right about your sentence is why inexperienced input from an amateur is dangerous to take into consideration.
That's not to say there aren't cops who think they can. ... I'm also sometimes amazed at how some "journalists" [don't treat] people the way they would want to be treated, themselves.
As cheesy as it sounds, you get more bees with honey.
I was covering a ridiculously long standoff in which the FBI was eventually called in after the first couple days. After some developments, two FBI agents approached me and ordered me to hand over the tape I was shooting on.
I refused; I knew my rights. There was nothing wrong with telling these agents no. Rather than put up with more fuss:
Lensmith said:
but it all comes down to "is it worth it to fight for the right, at that moment, with that specific situation?"
I told the agents that I'd be more than happy to
show him the video. Apparently, they decided that it was a much easier option than kicking up dust. They followed me to my truck, I popped the tape into a deck, and showed them the event they wanted to see. I worked with them; if they wanted to see it again, I obliged. Stop the tape at a certain point? Fine.
Eventually, they were satisfied and said goodbye.
Could I have stood my ground, acted stubborn, and picked a fight? Sure. But where would that have gotten any of us? Like it or not, we were all stuck at the same stand-off. Why make it more difficult for everyone involved?
I decided to work with them and show them what I'd recorded. If my willingness to help them out without being a dick about it helped them out, maybe I could ask them for a favor later on. Maybe one of them would drop me a tip later on in the stand-off or give me some sort of access nobody else would have. I wasn't going to hold my breath: it was the friggin' FBI.
Regardless, I like to operate under the idea that "you never know."