It is an offence to be in possession of more than 50kg of potatoes in WA, unless you have purchased the potatoes from a grower or retailer authorised by the Potato Corporation. Police also have the power to stop and search a vehicle suspected of carrying more than 50kg of potatoes. The maximum penalty is a $2,000 fine for a first offence or a $5,000 fine for subsequent offences, as well as a further penalty up to twice the value of the potatoes [Section 22, Marketing of Potatoes Act 1946 (WA)].