CHAPTER I The Republic
10. Provisions to secure protection of law
(4) No person shall be held to be guilty of a criminal offence on account of any act or omission that did not, at the time it took place, constitute such an offence, and no penalty shall be imposed for any criminal offence that is severer in degree or description than the maximum penalty that might have been imposed for that offence at the time when it was committed. .

CHAPTER I The Republic
10. Provisions to secure protection of law
(8) No person shall be convicted of a criminal offence unless that offence is defined and the penalty therefor is prescribed in a written law:
Provided that nothing in this subsection shall prevent a court of record from punishing any person for contempt of itself notwithstanding that the act or omission constituting the contempt is not defined in a written law and the penalty therefor is not so prescribed.