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There is an exception: unless you are large enough corporation or you are the state. It works rather well...

I know in NY there must be some sort of sign that informs people that there are security cameras watching. I assume it is the same in Illinois

So I should simply inform the police that I am videotaping them, but that I am not recording any audio. By continuing to arrest me, they are giving their consent to being recorded.

"Does that apply to security cameras?"

Private cameras, or those put there by government officials?

only if there is an audio recording being made.