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7/29/2019 Marijuana - Marijuana and Driving
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MarijuanaandDriving
Marijuana is directly linked to impaired driving. A meta--analysis
published in the peer-reviewed 2012 edition of Epidemiological Reviews
looked at nine studies conducted over the past two decades on marijuanaand car-crash risk. It concluded, drivers who test positive for marijuana or
self--report using marijuana are more than twice as likely as other drivers to
be involved in motor vehicle crashes.i
A widely cited article in the British Medical Journalfrom 2012 concluded that
marijuana use doubles the risk of car crashes.ii
Another recent meta--analysis of nine studies found that marijuana use
by drivers is associated with a significantly increased risk of being involved
in motor vehicle crashes.iii
FortheUnitedStatesin2009,63%offatallyinjureddriversweretestedforthepresenceofdrugs,whichisequivalentto3,952fatally,injureddrivers.
Narcoticsandcannabinoidsaccountedforalmosthalfofallpositiveresults.iv
Threedecadesofeducationondrunkdrivingandtoughlawshavehadthe
directeffectofreducingalcohol-relatedcarcrashesdramaticallyinthelast
thirtyyears.Infact,arecentsurveybytheU.S.DepartmentofTransportation
foundthat1in40nighttime,weekenddriverstestedpositiveforablood
alcoholcontent(BAC)levelof0.08a70percentreductionsince1973.The
surveytestedotherdrugsforthefirsttimeandfoundthat1in12testedpositiveformarijuana.Datafrompeer-reviewed,publishedresearchfinds
thatmarijuanaimpairsmotorcoordination,reactiontime,attentiveness,and
perceptionoftimeandspeed.
InastudyofseriouslyinjureddriversadmittedtoaLevelt 1shock
traumacenter,morethanaquarterofalldriverstestedpositivefor
marijuana.ResearchconductedattheUniversityofAuckland,New
Zealandfoundthat
7/29/2019 Marijuana - Marijuana and Driving
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habitualmarijuanauserswere9.5timesmorelikelytobeinvolvedin
crashes,with5.6percentofpeoplewhohadcrashedhavingtakenthedrug,comparedto0.5percentofthecontrolgroup.
iMu-ChenLi,JoanneE.Brady,CharlesJ.DiMaggio,ArielleR.Lusardi,KeaneYTzong,andGuohuaLi
iiM.Asbridge,J.A.Hayden,J.L.Cartwright.Acutecannabisconsumptionandmotorvehiclecollision
risk:systematicreviewofobservationalstudiesandmeta-analysis. BMJ,2012;344(feb092):e536
DOI:10.1136/bmj.e536
iiiLi,M.,Brady,J.,DiMaggio,C.,Lusardi,R.,Tzong,K.andLi,G.(inpress).Cannabisuseandmotor
vehiclecrashes.EpidemiologicReviews .
ivhttp://nationalallianceformarijuanaprevention.org/wp-
content/uploads/2012/08/fars_report_Fatally-injured-drivers-october_2011-Excerpt.pdf
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