In Virginia, the state primarily uses optical ballot scanning machines, according to this elections website. Here’s how it works: An optical ballot scanning machine counts marks made on paper by the voter. For people with disabilities who wish to vote privately and independently, a Ballot Marking Device and System would be used. Want to know more about these optical ballot scanning machines that we do use in Virginia? A polling place typically only needs one machine, with certain exceptions: For example, in a presidential election, a precinct with more than 4,000 registered voters will be required to have two ballot scanning machines.