A judge can appoint their own expert witness if they want to. They can also use a less formal "technical advisor": https://files.klgates.com/files/publication/b

A judge can appoint their own expert witness if they want to. They can also use a less formal "technical advisor": https://files.klgates.com/files/publication/bf2e184f-05cd-4fe3-a921-7b7f8f6e0b38/presentation/publicationattachment/5fe6d918-2bb2-4a2d-bfc1-8e00a8897688/antitrust_alert_06022016.pdf https://files.klgates.com/files/publication/bf2e184f-05cd-4f...