mind, i know the type from my usenet days. in polish usenet we had that crank called, i kid you not, expert, who presented himself as expert in almost everything.
some time later one bored person did an official query, and learned that apparently the fucker managed to get himself onto the state-approved list of expert witnesses in the area of computing (unclear if that predated his usenet antics or not)…
(that was mid-to-late 1990s, the cocom was just in the process of being lifted, and the judiciary really did not have much knowledge about the technical aspects of computing)