Andana Films has begun worldwide sales on Guillaume Massart's second feature film, "Detention", set inside the country's prison officer academy. The film will be part of the ACID sidebar at the Cannes Film Festival later this month. The documentary explores the training of prison guards but keeps the prison itself off-camera to reveal the society that builds it. The selection of the film at ACID Cannes is a recognition of Massart’s long-standing project.