A few states are using direct recording systems, without a paper trail:

https://ballotpedia.org/Voting_methods_and_equipment_by_stat...

"Currently only one state — Louisiana — keeps no paper trail of votes at all. Counties in eight states — Indiana, Kansas, Kentucky, Mississippi, New Jersey, Oklahoma, Tennessee and Texas — use a hybrid system" where some, but not all votes will have a paper trail.

(from https://madison.com/on-paper-ballots-for-the-2020-election/a...)