[Present state and evolution of the law of social defence (author's transl)].

The law of April 9, 1930 concluded to the non responsibility of the insane. It applyed a measure of social defence and treatment of some length. The evolution of ideas, the psychological and biological discoveries had bring a change in July 1964. The measure was finalized, not for the "insanes", but demented people, severe mental disturbed patients and severe mental retarded patients. The measure became non determined in time. The role of the lawyer is important, not only for the decision, but following the decision. The role of the physician is also important and the creation of a center of guidance becomes urgent. Therapy can be extended by ambulatory care with the necessary security measures.