Chapter Two : Fundamental Rights and Duties of Citizens
Article Twenty-Seven
No deed shall be considered a crime unless ruled by a law promulgated prior to commitment of the offense. No one shall be pursued, arrested, or detained without due process of law. No one shall be punished without the decision of an authoritative court taken in accordance with the provisions of the law, promulgated prior to commitment of the offense.
Fair trial standards
Non-retroactivity
Rights during investigation - not to be subjected to any form of coercion, duress or threat, to torture or to any other form of cruel, inhuman or degrading treatment or punishment
Rights during investigation - arbitrary arrest or detention and deprivation of liberty
Nullum crimen sine lege
Nulla poena sine lege
EDIT.