THC AND DRIVING – The government was advised and knew this law defied logic, ignored science and fact, and was unconstitutional but they enacted it in spite of this in a knee jerk response to criticism of the legalization of marijuana. This law has to go.

Lead author of five-year study says Canada laws penalizing drivers with less than five nanograms/ml of THC in their blood may be too strict.

Source: Low THC levels not linked to car crashes: UBC study