A disqualified driver recorded a blood alcohol reading of 0.119 when pulled over on the Eyre Highway at Penong on Friday.
Police stopped the vehicle at about 8.30pm on Eyre Highway for a mobile driver test.
The driver, a 29-year-old Yalata man, was reported for drink driving and also for driving while disqualified.
He was issued with a six-month loss of licence and his car will be clamped for 28 days.
He will be summonsed to appear in court at a later date.