Detention is a severe and psychologically traumatising form of withdrawal from society of people who, often, are already jeopardized or suffering from psychical or somatic diseases. Yet, the individual deprived of freedom has fundamental rights to obtain medical care that should be of equal quality than the general population. One of the numerous missions of the penitentiary practitioner is to fulfil his practice with total independence within a repressive environment, with multiple constraints of order, respecting both security and judiciary requirements and the fundamental ethical principles of penitentiary medicine.