In NSW, driving with the presence of an illicit drug in your system is an offence. You could face a criminal conviction, a fine of $1,100 and a disqualification from driving for six months.
The NSW Police can perform mobile and roadside drug testing for the following drugs:
- Meth, Ice & Speed.
- THC (cannabis).
How does mobile drug testing work in NSW?
If you are pulled over by NSW Police, the process will be as follows:
- The officer will request to see your driver’s licence.
- You will likely be submitted to a breath test for alcohol.
- The officer will then provide you with a plastic swab to swipe down your tongue.
- You will be required to wait for a few minutes to get the results.
If your test is negative, you will be free to leave. The sample you provide will still be sent to a laboratory for further analysis.
If the test comes back with a positive result, you will be banned for driving for 24 hours.
The results will also be sent to a laboratory and if the positive result is confirmed you will be contacted by the police and issued with a Court Attendance Notice.
The legislation also covers driving with the presence of prescription drugs. For example, if you have morphine present in your system when driving, you may be charged.
The only defence to a charge of driving with prescription drugs in your system is confirmation to the court that you were at the time prescribed the drug by a doctor.
If you operate a motor vehicle, you are required to submit a saliva sample to police upon their request. If you fail to provide a sample you will likely be charged with refusing to provide a sample and may face serious penalties including disqualification from driving.
How long do drugs stay in your system?
A fundamental issue that has arisen from this law is the length of time some illicit drugs stay present in saliva. It is not a requirement of the police to prove that you were affected by the drug, they merely have to show that is in your system.
Cannabis for instance is a drug that your body stores in your fat cells. The more you smoke or ingest cannabis, the longer it takes to leave your system. In some cases, it can take days or even weeks for cannabis to clear your system.
Case study – Bugden; Halper v R  NSWDC 346
In these two cases, the accused was detected with driving with cannabis present in their system.
In Halper’s case, he had smoked cannabis approximately four days prior to being arrested. In Bugden’s case, he had consumed cannabis approximately three days prior.
On appeal, in both cases the judge determined that no conviction was warranted in the circumstances and drew particular attention to the varying length of time cannabis remains in the system.
Defence – honest & reasonable mistake
In 2016 His Honour, Magistrate David Heilpern found Joseph Carrall not guilty of the offence of “driving with illicit drug present in system” due to finding that Mr. Carrall honestly believed that the drug would have been out of his system.
Mr. Carrall had actually been advised by a police officer prior to this offence that he needed to wait at least one week after smoking cannabis before driving. Mr. Carrall gave evidence that he had last smoked cannabis nine days prior to being stopped for a random test.
Accordingly, His Honour dismissed the charges against Mr Carrall.