So, when a cop walks up to you, and tells you to stop filming, and you tell him that you've read the law, and he tells you that he knows the law, and that you need to stop filming, or he will arrest you, who do you think will come out the winner of this curbside legal debate?

What do you think will happen to you?

What do you think will happen to the officer when we discover that his legal interpretation is incorrect?

The police don't actually need to know the law they are enforcing. And it's no sweat off their backs when they are wrong about the details.