Ontario plans to introduce new penalties for drug-impaired drivers ahead of legalized marijuana next July. Premier Kathleen Wynne says there will be zero tolerance for those 21 and under, novice drivers and all commercial drivers in Ontario who have a detectable presence of drugs or alcohol in their system. Toronto Mayor John Tory and a lot of other people have a lot of questions of exactly how that will be accomplished. What are the limits? Is there a reliable test to detect cannabis use? We speak with Detective Constable Kim Greener, from Toronto Police Services,who runs and coordinates drug and breath programs and an experienced Colorado town Police Chief John Jackson who has 4 years more experience at this than we do.