Some ballots have watermarks. The Dems know that, so fraud can only happen when lots of legal ballots are avalable. Send a ballot to everyone because of COVID. Then harvest them. So all "illegal ballots" could be "legal" paper, just the persons filling out the ballots are "illegal". Still can be traced, but will take a much longer time to find out.  https://cdn-0.stillnessinthestorm.com/wp-content/uploads/2020/11/watermarked-ballots-CISA-Gov-Agency.png