Paper ballots that can be tied to a legal voter for purposes of random audit. Any funny business, and it is off to jail.
You are forgetting who controls the audit. In the Minnesota Senate race, there were actually cases where paper ballots denoting votes for Coleman were counted as votes for Franken on the basis that those same ballots showed votes for Obama. The auditors found it inconceivable that one would vote for Obama and not vote for Franken, so the auditors "corrected" those errant Coleman votes. So much for paper ballots.
The people who cast the votes decide nothing. The people who count the votes decide everything.
-Josef Stalin-