Exactly 144 overseas voters used the mobile app to vote in West Virginia in 2018, even though most experts who focus on cybersecurity and voting say the Internet isn’t yet secure enough to mix with elections.

The broad push recently has been back to paper ballots and machines that produce a voter-verified paper trail, because they allow for election results to be double-checked in a way that can guarantee an election’s accuracy.

Many experts argue that no computer can be completely unhackable, so to get the public to have full faith in its elections, the voting has to be done on paper.

“I come down with getting as many computers out of the process as you can,” said Rich DeMillo, the former chief technology officer for Hewlett-Packard and now a cybersecurity expert at the Georgia Institute of Technology. “Every time you introduce a technology layer, you have these cascades of unintended consequences.”