Who carries out investigation for election-related criminal offenses?

Cook Islands
Cook IslandsElectoral Act 2004, Part 8– Disputed elections, 100
http://www.paclii.org/ck/legis/num_act/ea2004103/
100. Report topolice- Where on any inquiry conducted under this Part the Court is of the opinionthat any -
(a)electoral offence; or
(b)corrupt practice; or
(c)wilful irregularity,
hasbeen committed by any person, the Court shall refer the matter to theCommissioner of Police.