Who carries out investigation for election-related criminal offenses?

Singapore
Criminal Code Procedure 2010
Part IV
Investigation in arrestable cases
18.
—(1) A police officer may exercise all or any ofthe special powers of investigation under sections 21, 22 , 34, 39 and 111 wheninvestigating\ any arrestable case.
10
(2) The action of a police officer in\ such acase may not be called into question at any time on the ground that he lackedauthority under this\ section to exercise the special powers
of investigation under sections 21, 22, 34, 39and 111
Source: