. . "prosecuted (art. 2); Any person who has been in possession of arms, explosives or other weapons and who voluntarily turns them over to the authorities shall not be prosecuted (art. 3); If the persons covered by article 1 have committed crimes entailing loss of human life or permanent disability, the sentence shall be 15 to 20 years' imprisonment, when the legal penalty is the death sentence, and 1" . .