Prefectural police departments across the nation set up task forces Thursday to crack down on campaign violations prior to the Upper House election next month, focusing particularly on online activity.
With the ban on online campaigning no longer in force, the Metropolitan Police Department in Tokyo has assigned two investigators to the unit.
The Osaka Prefectural Police designated a number of officers who previously worked for IT-related companies to its task force.
The government is set to finalize the election schedule at Friday's Cabinet meeting, with official campaigning expected to start July 4.
Prime Minister Shinzo Abe's Liberal Democratic Party is seeking to regain control of the Upper House following its landslide victory in the Lower House election in December.