With paper ballots vote totals must match, but mail in ballots all you need is an extra CDROM. And, there is no way to check for vote eligibility or any paper trail to investigate.
All electronic ballot systems mean risk free cheating. Once the numbers are changed the old numbers no longer exist to incriminate.
2) Per John Lott Jr's article in the 2000s (written shortly after the Bush-Gore recount), the results are queried into a CD-ROM (Read-only drive), which isn't connected to the Internet and which itself a stand-only computer station in a secured location.
Not saying we need to do this in November, but there's simply no need for people to go to some polling location and wait in line to vote. I would support such a system as long as people register in person prior to voting, which produces an alpha-numeric character that they will need to vote on an app or secured webpage.