Plenty sauce on the GEMS system used in many state and county electronic voting machines.
https: //www.activistpost.com/2016/08/us-election-shocker-vote-will-rigged.html
https: //youtu.be/Fob-AGgZn44
This software allows the outcome for any race to be predetermined on a precinct basis. Also, supports avoiding the precincts that will be audited.