As the U.S. heads toward an especially contentious national election in November, 15 states are still clinging to outdated electronic voting machines that don’t support paper printouts used to audit their internal vote counts.

E-voting machines without attached printers are still being used in a handful of presidential swing states, leading some voting security advocates to worry about the potential of a hacked election.

Some makers of e-voting machines, often called direct-recording electronic machines or DREs, are now focusing on other sorts of voting technology, including optical scanners. They seem reluctant to talk about DREs; three major DRE vendors didn’t respond to questions about security.

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