A senior police officer has labelled the results of an operation appalling, and a threat to motorists' safety.
Acting Superintendent Mel Adams said 27 motorists who were charged with driving under the influence of drugs during the Logan operation.
Police charged 51 drivers with 62 offences during the crackdown.
Officers conducted random breath and drug tests and licence checks across Logan from January 16-18, with some conducted in heavy rain.
They issued 48 traffic infringement notices, and charged six motorists for driving under the influence of alcohol.
Acting Superintendent Adams said she was concerned about the results of the drugs tests.
"Of the 50 plus drug-driving related tests conducted, over 50 per cent of those drivers returned a positive test for the presence of relevant drugs," Acting Superintendent Adams said.
"That's an appalling statistic and a clear threat to the safety of our road users.
"Our drug driving testing program is rigorous and drivers need to understand the hazard they pose to the public.
"They also need to understand the risk they take themselves, in that they may find themselves before a court for driving under the influence of a drug."
Acting Superintendent Adams condemned drivers who took drugs before getting behind the wheel.
"Illegal drugs are not tested or regulated and therefore you never truly know what you are taking and how your body will react," she said.
