If quirky ATM machines randomly erased the accounts of 1 percent of their patrons, they'd quickly be taken out of service. Yet touch-screen electronic-voting machines that recorded no vote for 1 percent of voters in Florida's Democratic primary in March are set to be used again in nearly a quarter of the state's 67 counties. And Florida is hardly alone in switching to this relatively untested technology: 20 percent of the nation's 3,114 counties will use electronic voting machines in November. That rate of adoption alarms some experts. "We're not ready," warns Douglas W. Jones, a computer scientist at the University of Iowa in Iowa City. "I'm suspicious if we'll ever be ready."

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