And how would you prove they tampered with voting machines? The vote is encrypted when entered, correct? Are votes sent encrypted to a central database?
I keep thinking about why mentioned TEMPEST.
Voting monitors leak signals like all electronics. These signals can be reconstructed into what is displayed on monitor. The Q team could theoretically monitor all votes cast at a station BEFORE it was encrypted.
How? They could "see" and record each touch screen monitor from a distance using spy equipment (and this technology has been around for a long time). This would bypass the encryption and screwing around with votes downstream of the voter.
A TEMPEST class building prevents electronic signals and sound from leaving building because these leaking signals can be reconstructed by someone with the right equipment outside of the secure perimeter.