Actually I was thinking it would do exactly the opposite - even if a legitimate tape is leaked, now the victim can say, "that's fake" and it will be completely believable.
Or not the victim. Combine it with the girl with the dragon tattoo story, and it may become scary how helpless the victim could be under difficult circumstances with no piece of real evidence aka auto-marked as fake.
Believable, perhaps—but no less humiliating.