Right to fair hearing
Section 36(8) · 1999 Constitution (2004 edition)
What Constitution says
(8) 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 heavier than the penalty in force at the time the offence was committed
This is the 1999 Constitution as published in 2004. Later amendments aren't included yet, so a section may have changed since.
Original source
Official Gazette · CFRN 1999 official PDF · printed page 36–38. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections