Port Lincoln Police have detected three people who were allegedly driving with methamphetamine in their system last week.
Just before 2.30am on Saturday, May 12, a 37-year-old Port Lincoln man tested positive to methamphetamine when he was pulled over on Mortlock Terrace.
Then, just before midnight on Monday, May 14, a 38-year-old Port Lincoln man tested positive to methamphetamine during a random driver test on Barley Road in Port Lincoln.
At about 1.45am later in the week, on Thursday, May 16, a 57-year-old Port Lincoln woman tested positive to methamphetamine and cannabis when she was stopped in Liverpool Street.
Police sent all three positive samples for forensic testing.