Sooke RCMP say it was their largest targeted drug enforcement project in recent years and it involved more than a dozen local and regional Mounties.
The investigation culminated when police searched four homes over the last week and seized quantities of what they say appears to be heroin, cocaine, methamphetamine, GHB and marijuana.
Police say some Canadian currency and a luxury vehicle were also seized.
Mounties say 12 people from the Sooke area ranging in age from 18 to 48 were arrested and they now face a number of drug trafficking-related charges.
Police say they expect to make more arrests in the near future.