WA Police Internal Affairs unit has charged a female senior sergeant with corruption.
The 42-year-old woman held the position of officer in charge at a business unit within the Perth metropolitan region.
The investigation resulted from a change in the arrangements for the supply of products to the police business unit in early 2018.
The officer has been charged with corruption (under the provisions of the Criminal Code) and is due to appear in the Perth Magistrates Court on Friday.
She is currently stood down from all duties.