The only way to confirm that each ballot was cast by a human is to vote at your precinct, and to count votes publicly, by hand. Old school. Mail-in ballots should be counted at the precinct withresults written on the wall before precinct results are reported to the state.
This. ⬇️ Also, if vote centers are set up so that anyone in the county can vote there (eg, LA County), the centers must use e-pollbooks to confirm registrations & that voters haven’t already voted. E-pollbooks usually use WiFi or Bluetooth. Backup paper pollbooks are impossible.