What if there was a way to pre-certify the truth of political ads?

There are plenty of outfits that do fact checking after ads have been made. What if there was a way to present an ad to one of these places and have them announce at the end of the ad that all statements made have been certified as true, assuming that they are all indeed true. I am guessing this would not go over well with campaigners, since there is nothing to stop them from doing that now and they obviously have chosen not to do so.