I think every state has provisions for poll watchers from each party to witness what goes on at the polls, in order to validate there was no cheating.
I was a poll watcher for a couple of years in Yuma, Arizona.
When we put poll watchers at the polls, our percentage of Republican votes mysteriously went up significantly.
I did not witness any improprieties.
Not worrying about the polls. I’m worrying about the election offices who receive the supposed “mail in” ballots. The offices where boxes and boxes of bogus ballots are walked in to make up for the deficit in democrat votes. That is where the cameras are needed.