Article 108 — Rigorous Imprisonment.

(1) Rigorous imprisonment is a sentence applicable only to crimes of a very grave nature committed by criminals who are particularly dangerous to society. Besides providing for the punishment and for the rehabilitation of the criminal, this sentence is intended also to provide for a strict confinement of the criminal and for special protection to society. Without prejudice to conditional release, the sentence of rigorous imprisonment is normally for a period of one to twenty-five years but where it is expressly so laid down by law it may be for life. (2) The sentence of rigorous imprisonment shall be served in such prisons as are appointed for the purpose. The conditions of enforcement of rigorous imprisonment are more severe than those of simple imprisonment.