https://www.americanprogress.org/issues/democracy/reports/2018/02/12/446336/election-security-50-states/
"Confirmation that votes were correctly counted cannot be provided unless a reliable auditable paper trail exists that can be checked against the official election outcome. Paper ballots that are tabulated by optical scanning machines and voter-verified paper records produced by DRE machines offer a record of voter intent, which will exist even if voting machines are attacked and data are altered."
