That is not a theory. Just Google “ballot harvesting” and/or “absentee ballot fraud” see for yourself.
Tucker is absolutely correct about this:
Editor’s Note –
Yours truly has worked elections before. In Indiana the absentee ballots are delivered to the polling place and if the polling place chief is a Democrat for example said Democrat gets an envelope with the raw filled out ballots to put in the machine. I had to follow this person with a pen in her hand everywhere she went and could not take my eyes off her for a second as she walked around with these ballots and a pen in her hand for HOURS until she put them in the machine just a few minutes before the polling place closed. She was clearly trying to spoil Republican ballots.