Counting Votes 2012: A State by State Look at Election Preparedness
Sixteen states use paperless machines in some or all counties, prompting an “inadequate” grade. In other words, these machines produce no independent record of the vote cast, which is necessary for recounts or audits. These states are: Arkansas, Colorado, Delaware, Georgia, Indiana, Kansas, Kentucky, Louisiana, Maryland, Mississippi, New Jersey, Pennsylvania, South Carolina, Tennessee, Texas and Virginia.
The other 35 states use voting systems which either require the use of a paper ballot or produce a paper record.