Moreover, there are steps that officials can take to prevent fraud. The election law scholar Rick Hasen, a professor at UC Irvine Law School, recommends that states investigate and prosecute abuse where they find it; send a ballot application rather than a ballot to all registered voters, thus limiting delivery of ballots to incorrect addresses; and restrict the number of ballots any one person can collect from others.
Why we need postal democracy
The New York Review of Books, May 28, 2020 issue
May 7, 2020