Acting Provincial Police Commander Senior Inspector David Yapu issued the appeal on Monday after another Asylum Seeker was arrested and charged in Lorengau for being in possession of Marijuana.
He said police will be hard on them (foreigners) if they continue to break the laws of the country.
The man from Iraq, 25-year-old Ahmad Jasham was picked up by police at the boat shed at Lorengau town.
Jasham is expected to appear in court this week.
This is the seventh arrest involving those processed at the Regional Processing Center since the New Year.
Five were arrested in Manus for drunk and disorderly behavior as well as resisting police arrest.
Another residing in Port Moresby was arrested last week, also for being in possession of marijuana and is expected to appear at the Boroko District Court this week.
Meanwhile, PPC Yapu said Manus had a relatively quiet weekend with no major incident reported.
(Loop PNG file picture of road leading to Boat shed.)