All the general human rights treaties provide that no one may be convicted for an action that was not a criminal offence under national or international law at the time of the commission. Article 15 of the International Covenant on Civil and Political Rights (ICCPR) reads as follows: 1. No one shall be held guilty of any criminal offence on account of any act or omission which did not constitute a criminal offence, under national or international law, at the time when it was committed. Nor shall a heavier penalty be imposed than the one that was applicable at the...
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