Julie* uses cannabis oil, but when she drives to work she knows she is breaking the law. Photo: (ABC North Coast: Catherine Marciniak) When the pain gets too bad, Julie* puts a couple of drops of cannabis oil under her tongue, to ease her chronic pain and help her sleep. Driving with any THC in your blood system is a criminal offence in Australia Standard medical advice for medical marijuana patients is to wait for five days after using it before driving Professor Iain McGregor says it is important to use science to look at the impairment THC in the bloodstream causes It contains a low dose of THC — the psychoactive ingredient in cannabis. Certainly not enough to get her anywhere near stoned, she says. “Oh God, no. No way. I can barely tell the difference,” she said. “I don’t like feeling stoned, I don’t like smoking pot. […]