Port Lincoln Police found two men in possession of drugs at a traffic stop on Wednesday last week, 19 July.
Police allege that officers stopped a car on Oxford Terrace around midday and the driver underwent a roadside screening test which returned a positive reading for methamphetamine and cannabis.
A search of the vehicle then revealed 50 g of methamphetamine.
The driver, a 36-year-old man and his passenger a 26-year-old man, both of Port Lincoln, were arrested and charged with trafficking a controlled drug.
They were refused bail and appeared in court last Thursday, 20 July.
Police ask anyone with information about the manufacture, sale and possession of illegal drugs to call Crime Stoppers.