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)
4. No-one shall be the object of a sentence or security measure that is more severe than those provided for at the moment of the conduct in question or verification of the respective prerequisites, and criminal laws with a content more favourable to the defendant shall be applied retroactively.
EDIT.