The Bill of Rights guarantees every American right to a free press. The whole point of the press is to keep citizens informed and the government honest.
Back when the Bill of Rights was written, "the press" was literally people who could write and had access to a printing press. What the founding fathers probably didn't expect was a future where the Internet allows any American to write something online where millions can read it.
Even crazier, 50% of Americans have the ability to record high-quality video on a gadget that fits in their pocket, and then post it online for millions - potentially billions - to see.
Technology has stretched the definition of "the press" a lot, and - naturally - the shift is causing some legal and ethical problems. Today, I'm going to focus on the controversy of filming police officers, and whether or not they can really arrest you.