Unauthorized "experimental" software patches have been found voting machines in 39 Ohio counties ....

What kind of computer forensics should be done?

We also remove or quarantine the incident. Once the incident is under control, we use analytical and investigative forensic tools to analyse and demonstrate the cause of the incident.

So you confiscate and quarantine the affected equipment, test it, demonstrate performance, and the result becomes evidence if a crime has been committed.

So who goes to jail?

Someone is sneaking fraudulent software into electronic voting machines.

... breaking news ... lawsuit for ... injunction against Husted and ES&S to “halt the use of secretly installed ... software in 39 counties ...”

... contract between Republican Ohio Secretary of State Jon Husted’s office and ES&S ...

Has ESS ever been involved in voter fraud?

For the first time in 18 years a republican won the Nebraska US Senate seat who also showed to be trailing Democrat Ben Nelson who was elected by a landslide several years earlier.

It was unknown ...  that (republican) Hagal ... owned ... ESS ....  Here you have a republican candidate owning the voting machine company.

That would be a yes.

Where is the FBI when you need them?