Proven by every election official and every investigation that's ever examined it. WHy are you suggesting there "is not actual oversight or investigations into it?" There have been. How can you be unaware of them? This is the problem with the people screaming about "voter fraud." They seem completely unaware that there are safeguards and oversight and investigations and, on the few cases uncovered, prosecutions. There have been several Republicans prosecuted for voting twice, for instance. It is caught. It's not ignored. Please understand this.