RT Journal Article SR Electronic T1 Impaired driving and legalization of recreational cannabis JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E481 OP E485 DO 10.1503/cmaj.191032 VO 193 IS 14 A1 Sarah B. Windle A1 Crystal Sequeira A1 Kristian B. Filion A1 Brett D. Thombs A1 Pauline Reynier A1 Roland Grad A1 Carolyn Ells A1 Mark J. Eisenberg YR 2021 UL http://www.cmaj.ca/content/193/14/E481.abstract