法科学
Forensic science did not yet exist during Vidocq's time. Despite numerous scientific papers, the police did not recognize its practical benefits, and this could not be changed by Vidocq. Nevertheless, he was not so averse to experiments as his superiors and usually had a small laboratory set up in his office building. In the archives of the Parisian police are reports of cases that he solved by applying forensic methods decades before they were recognized as such.