[belorn]

From my fact checking, I compare to nations which also allow mail-in ballots but have much more stricter and expensive measure in place to prevent fraud. If the twitter fact checkers are correct then there is no substantially risk with mail-in ballots used by California, then using more strict measures are a waste.

Sweden where I live has several conditions on mail-in ballots. 1: it is only allowed as an exception for Swedish citizen currently residing in a other country. 2: A person must identify themselve through an embassy or the digital identity system which require a Swedish bank to perform identification. The first condition limits the scope of attacks and makes large scale attacks quite visible, while the second condition is very hard to perform. If you could break into hundred of thousands of peoples bank accounts, or take control over an embassy, voting fraud is unlikely your first priority.