This is a problem with overtechnical solutions already. Random mechanical points of failure. Pencil drawing a line is unambiguous.
Re: ballots in a trunk
This was an auditing/ procedural issue.
Re: receipts
Why not just turn in the receipts and count them. Why have a black box do the counting? If a machine says candidate A had a thousand forty votes and B had a thousand thirty, what are you going to do? How do you know if your receipt lied? If people keep their receipts, you no longer have anonymous voting. And what are you going to do, track down every voter? If those running the election keep the receipts, they should just count them manually.
https://mobile.twitter.com/virginianpilot/status/94358996960...
Regardless, this is actually the fault of the user rather than machines. As far as I know you can still get a replacement if you do this.
It was paper ballots and optical scan machines that led to the whole "hanging chad" situation.
And filling in a bubble with a pen or pencil isn't going to help. Anyone who read BBS G-philes in the 80's knows how to defeat a Scan-Tron.
If you let a machine count, you loose these checks.