Governor Tom Wolf wants a paper trail for votes in Pennsylvania.
The governor has ordered counties that plan to replace their electronic voting machines to buy systems that include a paper-based backup.
Pennsylvania is one of a handful of states that uses machines that only store votes electronically.
That makes double-checking accuracy, or checking for tampering, more difficult.
Counties are not required to replace their machines. Wolf's order simply gave directions about what systems to switch to if needed.
Allentown, PA 18102