All of which is why both software and hardware would be developed and provided solelyy by the FEC AND openly available for examination by anyone.
Anything less that that is easily defeated. A software developer with even modest skills could put in code to only turn on the vote skimming code on November 4th at 12:00 AM and turn it off at 6 AM the next day, that way the pre-election certifications would pass and any post election machines audits would pass. This is also why I hope the audit guys were smart enough to set the system clock to November the 5th @ 2AM.