What kind of computer forensics should be done?
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?
That would be a yes.
Where is the FBI when you need them?