The potential legalization of marihuana has resulted in discussion about new ways to investigate whether an driver’s ability to operate a motor vehicle is impaired by the drug:
Pot breathalyzer quest ramps up as legalization looms - May 22, 2016
Marihuana breathalyzers being developed as Canada looks to legalize pot - April 20, 2016
Ministers to examine impaired driving implications of marihuana legalization - May 25, 2016