Deepfaked videos are here already, I could see one passing as believable evidence (especially if it's shrunk down to a lower resolution, as in a high quality deepfake pretending to be a cellphone video).

We had this brief period of history where good records of actual events were cheap to capture and expensive/impossible to fake (governments have been airbrushing photos for most of this period, but videos seem to have been tougher). We're at the end of that now, but the public hasn't quite caught on. I think it'll take at least one high profile case getting overturned before society at large stops believing in videos. Then we're essentially back to trusting people at their word/digital-signature, and we'll probably have "trusted" security camera companies that install tamper-proof cameras at multiple angles that cryptographically sign videos while streaming them to remote servers. Before that, and probably after it as well, some of us will rot behind bars based on state-forged evidence.