Victoria recently updated its road laws to allow magistrates the discretion to choose between issuing a fine or suspending a driver’s licence for those who test positive for THC, provided the driver was using medicinal cannabis as prescribed by a doctor and was not impaired at the time.
If you are using cannabidiol-only (CBD) medications, you are legally permitted to drive, provided you are not impaired. However, it is an offence to drive with any detectable amount of THC in your system, regardless of whether you are impaired or not.
You cannot drive legally if you have any detectable amount of THC in your system. The THC can be detected in a roadside saliva drug test. Transport Victoria recently released a factsheet to guide patients prescribed medicinal cannabis for a medical condition on drug driving laws.