Who carries out investigation for election-related criminal offenses?

Sierra Leone
Election Act 2012
PART XII–ELECTORAL OFFENCES COURT
http://www.sierralii.org/files/2012-04.pdf
137. (1) Pursuant to subsection (3) of section 131 of the Constitution, there is hereby established a division of the High Court to be known as the Election offences Court.
(2) The Election Offences Court shall sit in such places in Sierra Leone as the Chief Justice may determine and shall be presided over by-
(a) A High Court Judge; or
(b)A retired Judge of the Superior Court of Judicature; or
(C) A barrister or solicitor who is qualified to hold office as a High Court Judge.
(3) The Election Offences Court has jurisdiction to try any election offence under this Act.
(4) A defendant in a trial before the Election Offences Court may be represented by the counsel of his own choice.
(5) A trial before the Election Offences Court shall be by summary procedure and bail shall be at the absolute discretion of the Court.
(6) All trials by the Election Offences Court shall be by judge alone and shall be concluded not later than six months after the establishment of the Court under this section.
(7) A person convicted of an offence under this Act may appeal to the Court of Appeal.