It's not tampering that we should be worrying about. Each individual machine would need to be opened and changed, which is very unlikely. What is easy to do is to have dishonest poll workers vote for anyone who is on the rolls but didn't show up to vote....dead, moved, hospitalized, etc. The epoll book tells them if a person has voted already.
Heavily Dem areas often send in their results much later than other areas. I wonder if they just vote again and again as many times as they need to until they get enough votes to win.
How can a virus infect a machine that is not on the internet in any way?
Many of the faulty systems have wireless and other connections, including connections to phone lines, and can be infected with viruses or other malware from the time they’re built in secrecy in factories in communist China.