Police do test for impairment. If an officer has good cause to suspect a person has consumed a drug or drugs, then an officer can ask a driver to undergo the Compulsory Impairment Test (CIT). This is a behavioural test undertaken by a specially trained police officer and is part of current policing practice and will continue to be used.

The Land Transport (Drug Driving) Amendment Act 2025 enables Police to also test for recent use of qualifying drugs using a mobile drug screening device. This gives us the ability to stop a driver at the roadside. Police do not need good cause to suspect a driver has consumed drugs for oral fluid testing. Anyone at any time could be stopped at the roadside and requested to undertake a drug screening test. It is a test for presence (of an impairing drug that has been recently used) and not impairment.