Related Rule
Sierra Leone
Practice Relating to Rule 100. Fair Trial Guarantees
Section N. Non bis in idem
Sierra Leone’s Constitution (1991) states:
23. Provision to secure protection of law.
(9) No person who shows that he has been tried by any competent court for a criminal offence and either convicted or acquitted shall again be tried for that offence or for any other offence of which he could have been convicted at the trial for that offence save upon the order of a superior court made in the course of appeal proceedings relating to the conviction or acquittal; and no person shall be tried for a criminal offence if he shows that he has been pardoned for that offence:
Provided that nothing in any law shall be held to be inconsistent with or in contravention of this subsection by reason only that it authorises any court to try a member of a defence force for a criminal offence notwithstanding any trial and conviction or acquittal of that member under service law; but any court so trying such a member and convicting him shall in sentencing him to any punishment take into account any punishment awarded him under service law.
(10) Nothing contained in or done under the authority of any law shall be held to be inconsistent with or in contravention of any provisions of this section … to the extent that the law in question authorises the taking during a period of public emergency of measures that are reasonably justifiable for the purpose of dealing with the situation that exists before or during that period of public emergency.
29. Public emergency.
(2) The President may issue a Proclamation of a state of public emergency only when –
a. Sierra Leone is at war; [or]
b. Sierra Leone is in imminent danger of invasion or involvement in a state of war; or
c. there is actual breakdown of public order and public safety in the whole of Sierra Leone or any part thereof to such an extent as to require extraordinary measures to restore peace and security; or
d. there is a clear and present danger of an actual breakdown of public order and public safety in the whole of Sierra Leone or any part thereof requiring extraordinary measures to avert the same; or
e. there is an occurrence of imminent danger, or the occurrence of any disaster or natural calamity affecting the community or a section of the community in Sierra Leone; or
f. there is any other public danger which clearly constitutes a threat to the existence of Sierra Leone.
(5) During a period of public emergency, the President may make such regulations and take such measures as appear to him to be necessary or expedient for the purpose of maintaining and securing peace, order and good government in Sierra Leone or any part thereof. 
Sierra Leone, Constitution, 1991, Sections 23(9)–(10) and 29(2) and (5).