Until 25 March 2019, Cesare Battisti denied having committed any of the murders he had been sentenced for; on that date he admitted to the chief prosecutor of Milan (Francesco Greco) involvement in four killings. The circumstances of his sentence have been questioned. A movement claiming Battisti's innocence is active in the media and in public opinion (especially in France and Italy). Among the most vocal supporters of Battisti are the writers Fred Vargas, Valerio Evangelisti and Bernard-Henri Lévy. They consider that the trials conducted in Italy were marked by irregularities. These alleged irregularities involved the use of torture (Battisti's French lawyers have not used this peculiar charge, the violation of article 3 ECHR, in their rejected claim to ECtHR), and the misuse of witnesses: according to Battisti's supporters, witnesses against Battisti were either affected by mental troubles, or were "collaboratori di giustizia", (that is, defendants testifying against other defendants in order to benefit from a reduced sentence. Those peculiar witnesses are also used by French justice, i.e. art. 132-78 French "Code pénal"). Battisti's supporters also claim that ballistic analysis and graphological expertises used in Italian court cases do in fact exonerate Battisti, contrary to what the courts considered.