TITLE II
FUNDAMENTAL RIGHTS AND DUTIES
CHAPTER II
FUNDAMENTAL RIGHTS, FREEDOMS AND GUARANTEES
SECTION II
GUARANTEE OF FUNDAMENTAL RIGHTS AND FREEDOMS
Article 65
(Application of criminal law)
2. No-one shall be sentenced under criminal law unless the act or omission in question is punishable under the terms of a pre-existing law, nor shall any person be the object of a security measure unless the prerequisites are laid down in a pre-existing law.
EDIT.