In the late 80’s, I met the guy who invented the first dash cam. He told me that there were a couple unintended benefits.
One was in clearing cops in cases like this when they were innocent, the other was when a drunk was pleading his innocence in court to wheel in the TV and show the dash camera film.
Lots of dash cams in Russia, Eastern Europe and China. It keeps people from trying to lie their way out of accidents.
Most of the time even before it is shown in open court.
The defense well plea deal after seeing the video in a pre trial conference.