“Drivers who take medicinal cannabis for cancer or mental health or pain relief, are not willing to put themselves in a position where they are potentially going to be prosecuted for driving while taking a medication that is prescribed,” she said.
"These people are often very conscious of not driving when they feel impaired by their substance but the legislation as it stands, it doesn’t matter if you are impaired or not, it’s only if the substance is in your system.
The key issue is they are testing for the presence of THC which can remain in the body a long time, long after it would have no effect on driving. If they cannot detect impairment, what’s the point? Now nobody with a legal medical cannabis prescription can drive without fear of being tested.