A couple of weeks ago we spoke to the Drug Foundation after the Government announced that Police will begin roadside drug driving tests. Police will test for four types of drugs - cannabis, cocaine, ecstasy and meth - using an oral-fluid testing device. As more information about the testing device has been released, so has commentary. While everyone can agree we don't want impaired drivers on our roads, questions have been raised about the decision to test for the presence of drugs rather than impairment. University of Otago Professor Joseph Boden talks to Jesse.