TITLE ONE
CHAPTER I
Fundamental rights
Article 14
No law will have retroactive effect.
No one can be deprived of his freedom, properties or rights without a fair trial before previously established courts, complying with the essential formalities of the proceedings and according to those laws issued beforehand.
With regard to criminal trials, it is forbidden to impose any penalty which has not been expressly decreed by a law applicable to the crime in question, arguing mere analogy or majority of reason.
In civil trials, final sentence must agree the law writing or the legal interpretation thereof. In the case of lack of the appropriate law, sentence must be based on the general principles of law.
EDIT.