Cannabis patients who ignore the standard medical advice to wait five days before driving are risking more than a fine or a suspended licence.
If they are involved in an accident, their insurance will be voided.
If another person is injured, they could face criminal charges of driving while impaired.
Medical marijuana reduces patients' independence
Karen Hitchcock is a pain specialist who prescribes cannabis and says it is an extremely difficult decision for her patients to make."Often, people choose not to take the medicine because it results in such a huge decrease in their independence.
"I've had patients who have come to me on high doses of opioids and Valium, and they gradually use cannabis to wean off their other medications.
But because they can't tolerate the prohibition on driving, they say, 'I'm just going to go back on my opiates and Valium'."
The growth in medical cannabis has been astonishing.
At the beginning of last year, there were around five applications per month approved for medical cannabis products.
By December, it had rocketed up to 141.
That has bumped up against the toughest roadside drug testing regime in the world, which is also expanding.
Law Institute of Victoria president Stuart Webb says it is slightly anomalous.
"Other countries have looked at this and have provided some provision for people to drive with a level of THC with the blood system," he said.
"I think that we need to look at that."
Reason Party MP Fiona Patten says cannabis is being treated differently under the law to other prescriptions drugs like opioids and benzodiazepines.
"There's an easy fix to this: include medicinal cannabis patients in our Road Safety Act to say that someone who is found to have a presence of THC is not breaking the law, unless they are driving when impaired."
Patient gives up licence to use THC oil
Until then, other patients, like Josh Gatehouse, decide the trade-off is worth it.
Mr Gatehouse, who has autism, gave up driving when he started taking a low THC oil to bring is racing thoughts under control.
It has enabled him to settle into study for the first time in his life.
"I've being drifting for so long."
But in a small country town, giving up driving is a huge decision.
"By the time they wake up in the morning, they won't be impaired at all, just as you wouldn't be if you had a few glasses of wine the night before, but they are still unable to drive for five days," Dr Hitchcock said.
"Do we want every patient who's taking medicinal cannabis to never drive? I mean, that's not feasible," said Professor Iain McGregor, from the Lambert Initiative into Cannabinoid Therapeutics at the University of New South Wales.
"Rather, we have to use science to look at impairment and the complex relationship between THC levels in your body and driving performance, rather than just having a very simplistic view that if you have THC in your saliva, you should be off the road."
But leaving that decision in the hands of drivers is a move cautioned against by Michael Fitzharris, associate director of Monash University's Accident Research Centre.
"They actually have that artificial feeling of wellbeing," Associate Professor Fitzharris says.
"While the skills that they need — like concentration and reaction time, when you need to respond — aren't always there."
Mr Gatehouse has his own idea for a solution — re-testing medical cannabis patients while they are on their medication.
"I could go back and do the same tests that I did in the first place to check whether I'm capable of driving and reassess my ability as a patient," he said.
"It's like alcohol prohibition ending at the moment. Everybody's scrambling to see how it all fits together in the system." Source & Credits - https://www.abc.net.au