Motorists in New South Wales with a prescription for cannabis products will soon be granted special allowances.

The NSW Government has announced it will introduce new laws to ensure those who use medicinal cannabis will no longer be automatically penalised if found to be driving with tetrahydrocannabinol (THC) in their systems, provided that laboratory tests show they are under a set limit.

THC is the principal psychoactive compound found in cannabis.

The reforms will require all cannabis users with a legal prescription to register with Transport for NSW, providing documentation and completing an online driver safety course specifically related to the effects of drug driving.

Learners, provisional licence holders, and commercial drivers are excluded from the program.

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However, registering with the government won’t provide an exemption from roadside testing – nor from penalties.

If a driver returns a positive roadside drug test, they’ll still receive an immediate 24-hour driving ban, with a saliva sample then sent for more comprehensive laboratory testing.

Those found to have been driving with THC in their system – above a maximum threshold of 50 nanograms per millilitre of THC, according to ABC News – will have their licence suspended for three months and will receive a fine of $704 on the third offence.

A three-strike rule will be introduced, which the government says will “give drivers the opportunity to adjust their dose and driving behaviour after medicine use”.