Terrorist attacks and other traumatic events often cause psychological trauma, even in the absence of physical injuries, not only among the victims, of course, but also among witnesses. Witnessing this type of event can cause suffering that, in the months and years that follow, is likely to become severely debilitating—whether in terms of mental health, social relationships, or overall quality of life. That is why, following the attacks that struck France in 2015, Santé publique France established a monitoring system for the psychotraumatic impact of terrorist acts and the associated care pathways, based on: