Joondalup Senior Sergeant Craig Wanstall said the residents phoned local police and left notes on the windshields of neighbours' vehicles to warn them of suspected illegal activity at a Manito Court property.
Police raided the home about 4.45pm on May 22, where they seized cannabis, syringes, scales and unknown drugs, which will later be tested.
A 52-year-old man was charged with drug possession, possession of drugs with intent to sell or supply, possession of smoking utensils and possession of drug paraphernalia.
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