Dominique de Villepin is currently "assisting police with their inquiries," as they say in England. In garde à vue, as they say in France. The affair has to do with the prestigious hotel chain Relais et Châteaux, of all things. Régis Bulot, the former CEO of the chain and friend of Villepin, is facing various charges, and the police want to know if Villepin was somehow involved in his alleged wrongdoing.
To stay out of trouble in France, it seems, a politician has to stay in office, although sometimes even that is not enough.