Comparing jurisdictions

Expert

In the USA, experts are called expert witnesses because their status is that of a witness. Like in France, they can touch the items of evidence or bring documents to support their testimony. In one of the drawings here, the female expert is being questioned by a lawyer. The judge and the other lawyers are listening, and the typist is busy writing everything down.
On another, the man is perhaps a police inspector, or an expert in weapons with blades.