The US Voting Systems are governed by 52 USC 20902
52 USC 20902(a)(2)(C): Use of fundsA State shall use the funds provided under a payment under this section…with a voting system (by purchase, lease, or such other arrangement as may be appropriate) that—
(C)meets the requirements of section 21081 of this title.
52 USC 21081 Voting Systems Standards:…
(2)Audit capacity
(A)In general
The voting system shall produce a record with an audit capacity for such system.
(B)Manual audit capacity
(i)The voting system shall produce a permanent paper record with a manual audit capacity for such system.
(ii)The voting system shall provide the voter with an opportunity to change the ballot or correct any error before the permanent paper record is produced.
(iii)The paper record produced under subparagraph (A) shall be available as an official record for any recount conducted with respect to any election in which the system is used.
https://www.law.cornell.edu/uscode/text/52/20902
https://www.law.cornell.edu/uscode/text/52/21081
SO WHAT IS WE THE PEOPLE TO DO WHEN THEY VIOLATE THESE RULES?
File a False Claims Act case because they have taken Federal Funds but haven't provided the service and haven't lived up to their Grant Program Requirement under the 'Help America Vote Act'