Found this Reason article that seems to answer the question as to the laws in every sate for video recording.
7 Rules for Recording Police
Rule #1: Know the Law (Wherever You Are)
Conceived at a time when pocket-sized recording devices were available only to James Bond types, most eavesdropping laws were originally intended to protect people against snoops, spies, and peeping Toms. Now with this technology in the hands of average citizens, police and prosecutors are abusing these outdated laws to punish citizens merely attempting to document on-duty police.
The law in 38 states plainly allows citizens to record police, as long as you don’t physically interfere with their work. Police might still unfairly harass you, detain you, or confiscate your camera. They might even arrest you for some catchall misdemeanor such as obstruction of justice or disorderly conduct. But you will not be charged for illegally recording police.
Twelve states—California, Connecticut, Florida, Illinois, Maryland, Massachusetts, Michigan, Montana, Nevada, New Hampshire, Pennsylvania, and Washington—require the consent of all parties for you to record a conversation.
However, all but 2 of these states—Massachusetts and Illinois—have an “expectation of privacy provision” to their all-party laws that courts have ruled does not apply to on-duty police (or anyone in public). In other words, it’s technically legal in those 48 states to openly record on-duty police.
Rule #2 applies to my idea of informing them you are recording from the beginning.
Author of Buy Gold and Silver Safely
Next book: Illusions of Wealth - due out soon
Also writing book We the Serfs!
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