A voter casts his ballot during a special election in Georgia’s 6th Congressional District special election last June. Georgia is the largest state that exclusively still uses electronic voting machines that don’t leave a paper trail, a major concern for election officials and cybersecurity experts.

A voter casts his ballot during a special election in Georgia’s 6th Congressional District special election last June. Georgia is the largest state that exclusively still uses electronic voting machines that don’t leave a paper trail, a major concern for election officials and cybersecurity experts.