The technology is there. It would not be difficult to make the process auditable down to the individual ballot, with that ballot linked to a legitimate, verified and eligible identity. In fact, every election should include an audit that includes a statistically significant number of voters verifying their ballots.
Watch how the unmarked ballot is handled before is handed to voter. What you said is true. It is being done before a ballot is handed to the voter. Ballot is tied to an traceable individual
Yep, fingerprint or some other ID.