A 41-year-old man has been arrested after more than $100,000 in cash and about 10kg of what appears to be synthetic cannabis was seized during a police raid of a clothing store south of Perth.
Police said they found the items while searching the Rockingham business on Tuesday.
They later searched the man's home, where they seized cannabis and paraphernalia used for smoking cannabis.
No charges have been laid, pending analysis of the suspected drugs.
Inquiries are underway to assess whether the cash represents proceeds of crime.