Experts who studied the systems say software glitches, vulnerability to hacking and the possibility of manipulation by company insiders or election workers are among the major concerns. But the biggest worry is that the machines provide no hard-copy paper trail, making it hard to detect and correct those problems if they occur.
David Dill, a professor of computer science at Stanford, likens using a touch-screen machine to "walking into a polling place and dictating your votes to a guy behind a curtain," who then puts the ballot in a locked box without letting the voter check his or her picks.
"There is lack of accountability," he said. "The right solution is to have an independent way of checking the ballot."
Waiting for a paper trail
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