The "commission de révision des condamnations pénales" nevertheless accepted, on 11 April 2005, a reopening of Guillaume Seznec's conviction for murder.
At this point, Avocat général Jean-Yves Launay required the benefit of the doubt, to Seznec's benefit, raising more particularly the possibility of a police plot - the trainee inspector Pierre Bonny (twenty years later to be assistant to Henri Lafont, head of the Gestapo française) and his superior, commissaire Vidal were charged in the inquiry.
At his side, the conseiller rapporteur Jean-Louis Castagnède maintained the opposite opinion, deducing on the one hand any such manipulation seemed improbable due to the few acts established by Bonny and on the other that the experts solicited by the cour de cassation had established that Guillaume Seznec really was the author of the false promise of sale of Quéméneur's property seized at Plourivo.
The Seznec family at first intended to take the case to the European Court of Human Rights, but gave up on their lawyers' advice.
Based on these comments, since the court refused to have searches carried out in light of the December 2006 decision of the Court of Revision, lawyer Denis Langlois decided to undertake private searches on 24 February 2018 with the consent of the owner of the Seznec residence in Morlaix, in an attempt to uncover Pierre Quéméneur's body.
Several works have been published on the affair, and Yves Boisset directed the film L'Affaire Seznec in 1992, with Christophe Malavoy in the lead role and also starring Nathalie Roussel, Jean Yanne and Bernard Bloch.