Under Article 28 (7) of the Constitution “No person shall be charged with or convicted of a criminal offence which is founded on an act or omission that did not at the time it took place constitute a criminal offence”.
L'article 28, paragraphe 7, de la Constitution dispose que "Nul ne sera accusé ou condamné pour des actions ou omissions qui, au moment où elles ont été commises, ne constituaient pas un acte délictueux.