Enquête sur un scandale d'État (Investigation into a state scandal), is a French crime thriller that was released to film festivals in 2021 and to wider audiences in February 2022. In Australia, the United States, and the United Kingdom it was released as "Undercover".

It is directed by Thierry de Peretti from his own screenplay (co-written with Jeanne Aptekman), and although it is a work of fiction, it is inspired by the real life case of François Thierry, and the book L'Infiltré (The Informant), written by Hubert Avoine and Emmanuel Fansten.

It stars Pio Marmaï, as Stéphane Vilner, the journalist who writes the story of Hubert Antoine (played by Roschdy Zem), the whistle-blower who breaks the story of illegal activity by the head of the Narcotics Unit, Jacques Billard, played by Vincent Lindon. The question driving the journalist and his colleagues at Liberation is, "how far should the state go to try to break the illegal drugs trade?"