In addition, lots of election officials complain that paper audit trails cause more problems than they solve.

NPR: Congress Plans to Address Electronic Voting

That's the rider in the skills audit of the nation in the competitiveness white paper Michael Heseltine conducted in 1996.

BBC: Competitiveness before breakfast lunch and dinner

For this year's general election, Nevada is the only state where virtually every voting machine has a paper backup that could aid in a machine malfunction, an audit or a recount.

CNN: Nevada improves odds with e-vote