POLICE officers held a vehicle stop on Tranmore Street in Canning Vale about 2.30pm on July 4. During a search of a vehicle, police located more than $50,000 in cash. Further inquiries by officers resulted in the search of a home on Scarborough Beach Road in Osborne Park. The house had been converted to grow hydroponic cannabis. Further inquiries resulted in Armadale Detectives executing a drug search warrant on July 5 at a home in St Kilda Road, Rivervale. Police seized more than 60 cannabis plants from the Rivervale home, which had been fully converted to grow cannabis. Four people have been arrested and charged with drug offences.