No offense, but I think that “ballot scanners with frickin’ vote erasing lasers on their heads” is going a bit too far into tinfoil hat land.
Not only would the scanners need ink erasing lasers installed, they would also need a means to print a new vote on the ballot, and do it in such a way that it matches the ink color and penmanship of every other mark on the ballot.
Oh, and both the erasing laser and the color print head has to be undetectable by maintenance personnel.
Agreed. Also, I doubt that the erasing could leave no trace of the original vote and leave no evidence that the erasing had occurred.