[dghlsakjg]

It’s also a solved problem for mail in.

Double envelope systems, observable counting systems and standardized ballots that can checked for non uniqueness before voting are how they do it.

People have thought hard about this, and it has worked fine for may states for decades now.

[closewith]

That only solves the double-counting problem, and it's fundamentally impossible to solve the voter ID and voter manipulation problems with postal voting.