In Testifying as an expert witness in computer crimes cases, Deb Shinder writes:
If you’re an expert in computers, networking, and related matters, you might be able to qualify as an expert witness in court cases (both criminal and civil) that involve the use of computers and networks. Here’s what you can expect if you go the expert witness route.
NOTE: Prosecutors and defense teams also sometimes employ “consulting experts,” who provide technical explanations and opinion in helping the prepare the case, but don’t actually testify in court.