Not Clearly Pro or Con to the question "Do Electronic Voting Machines Improve the Voting Process?"
"The results from this study show that a county’s buying touchscreens will increase their annual expenditures by 57.3%. Owning optical scanners should increase their expected annual costs 16.9%. Optical scanners have the further advantage of providing a voter verified paper ballot that can be used to audit the machine’s data and for any needed independent recount."
"Report on a Survey of Changes in Total Annual Expenditures for Florida Counties Before and After Purchase of Touch Screens and A Comparison of Total Annual Expenditures for Touch Screens and Optical Scanners," Dec. 1, 2005