“…Additionally, driving under the combined influence of both cannabis and alcohol is not an uncommon behaviour. Research conducted in Canada, Switzerland, New Zealand, France, Australia, Italy and the United States indicates that the concurrent presence of alcohol is common among suspected impaired drivers who test positive for cannabis (Senna et al, 2010;Couper et al, 2014;Wood & Salomonsen-Sautel, 2016), as well as among cannabis-positive drivers involved in injury crashes (Mura et al, 2003;Longo et al, 2000;Favretto et al, 2018) and in fatal crashes (Poulsen et al, 2012;Laumon et al, 2005;Romano et al, 2017;Davey et al, 2020;Drummer et al, 2003;Beasley et al, 2011). However, the implementation of THC limits may not be the most appropriate approach to managing cannabis-impaired driving, with or without concurrent alcohol impairment, for several reasons.…”