SECTION ONE
CHAPTER 2. HUMAN AND CIVIL RIGHTS AND FREEDOMS
Article 54
1. A law, which introduces or increases liability, shall not have retroactive force.
2. Nobody may bear liability for an action, which was not regarded as a crime when it was committed. If, after an offense has been committed, the extent of liability for it is lifted or mitigated, the new law shall be applied.
EDIT.