Two people are expected to be charged.
Gang Crime Squad have seized illicit substances and drug paraphernalia during a search warrant in Kwinana on Thursday morning.
Officers executed a search warrant on Hutchins Way, where they located and seized a small quantity of cannabis, drug paraphernalia and steroids.
A 39-year-old man was arrested on an outstanding warrant and will be charged by summons with possessing cannabis and possessing a smoking implement.
A 20-year-old woman will be charged by summons with the same offences.
Wanted woman known to frequent Mandurah, Rockingham, West Pinjarra areas
Waikiki Beach Hotel to go ahead after liquor licence approved
Man found critically injured outside Baldivis pub
Dawesville man charged with 38 child sex offences
Mandurah land owners reminded to prepare properties for upcoming fire season
Winning $2.5 million Lotto ticket sold in Bertram
Shark advice issued for White Hills Beach
Mayor reassures community after 13 trees removed from old King Carnival site
State Government invests $5 million to help restore Peel-Harvey Estuary