As a part of a statewide police operation a Riverland driver has tested positive to methamphetamine.
A 57-year-old woman from Loxton tested positive to the substance, as police were conducting operation return to school earlier this week.
Police also added the driver did not have any children in the car at the time.
The operation in total saw 131 expiation's issued statewide for various offences.
Superintendent Robert Gray, the officer in charge of the Traffic Services Branch, said the behavior of motorists during the operation is unacceptable.
The driver was issued with a driver direction notice not to drive for 24 hours.