It's a feature—I swear
That brings us to the next leg of the Triad—vote by mail, aka absentee voting. On its face, having ballots mailed out to every voter that they can fill out and return at their leisure sounds great. It sounded great to every nation in the European Union as well. They all tried it in one form or another, and every one of them went back to traditional in-person voting because of fraud. They, at least, could learn from their mistakes. Although, from the perspective of the fraudster, the ease of election manipulation through vote by mail is a feature, not a bug.
Two major aspects of vote by mail systems support fraud—anonymity and volume. When a vote by mail ballot is received for counting, it is assumed that the ballot came from the indicated voter, but there is actually no assurance that is true. In many jurisdictions, there are signature requirements, but as we have seen, such checking fails to detect all but a small fraction of fraudulent ballots, and will likely even reject some legitimate ballots by mistake.
Lots of useful raw material
Regarding volume, in states such as California and Washington, millions of ballots are mailed out, and typically less than half are returned. It is assumed that those ballots not returned are discarded and have no effect on election results. As we shall see, that is a grossly false assumption.
The problems with vote by mail systems run deep but we will only be able to touch on a few of them. Even that few, though, are enough to wreak great harm. Take, for example, the simple act of ballot interception. In this approach, ballots are collected from mailboxes, common apartment areas, dumpsters and trash receptacles, and many other sources, never actually being delivered to their legitimate recipients.
These intercepted ballots are marked, signed with a forged signature, and returned. The legitimate voter either had tossed their ballot away, or assumed it had been lost in the mail. If they vote in person, they are likely to learn that they have already voted, or at least that a vote was recorded in their name. At that point it is too late to recover the fraudulent ballot, and the most that might be possible is to record a second vote for the victimized voter, although, most states do not allow that. First in, first counted.
On the other side, vote by mail supports ballot replacement. This is where voters return their ballots, but the outgoing ballot is intercepted, and the contents replaced with a fraudulent ballot before it reaches a secure collection point such as a post office.
Alternatively, many states, including California, allow ballot harvesting. This is where people are allowed to collect ballots from others, ostensibly for delivery to a mail box or ballot box.