Police claim they have disrupted a major cannabis growing ring that concealed its operations in suburban and rural properties south of Perth.
Two men and two women were last night charged over the discovery of elaborate hydroponics set-ups at three Peel properties.
Organised crime squad detectives raided several homes yesterday after a four-month operation targeting the group, which they allege had been harvesting hundreds of thousands of dollars of cannabis each year.
Det-Sgt Andy Coen claimed detectives had found converted sheds filled with marijuana plants in different stages of growth to provide regular harvests.
Purpose-built rooms in the sheds had split-system air conditioning and extra lighting, while power meters had been bypassed to get free electricity to run the elaborate set-ups without alerting authorities, police claimed.
Police believe the four people arrested played different roles in the syndicate and had attempted to avoid having the properties where the drugs were grown being seized under WA's tough proceeds of crime laws.
But Det-Sgt Coen said the assets would be frozen by investigators.
Police charged two men aged 52 and 44 and two women aged 33 and 56 with cultivation of cannabis with intent to sell or supply and steal electricity.
The 44-year-old man and a 32-year-old man were charged with conspiracy to possess unlicensed firearms.