Police allege Maylea Tinecheff was stopped in her BMW on Ranford Road in Canning Vale on Friday. A preliminary roadside test was positive for illicit drugs.
The positive reading has been sent to the WA ChemCentre for confirmation. The results are expected to be known within a week. If positive test is confirmed, police say Ms Tinecheff will be charged.
Drivers found with illicit drugs in their oral fluid face a maximum $500 fine and three demerit points for a first offence. The more serious charge of driving under the influence of drugs carries a fine of between $900 and $2500 and a 10-month disqualification for a first offence.
The booze bus incident happened two days after Cousins was arrested at Ms Tinecheff’s Canning Vale home and charged with breaching a violence restraining order, making threats to injure and possessing 13g of methamphetamine