Work Truck Logo
MenuMENU
SearchSEARCH

Marijuana-Linked Road Deaths Up in Colorado

In 2016, Colorado drivers in fatal crashes tested positive for marijuana 20% of the time. The state voted to legalize recreational use of the drug in late 2012.  

by Staff
August 29, 2017
Marijuana-Linked Road Deaths Up in Colorado

Photo courtesy of the National Highway Traffic Safety Administration.

2 min to read


Photo courtesy of the National Highway Traffic Safety Administration.

The number of Colorado drivers who have tested positive for marijuana use after a fatal crash has more than doubled since 2013, according to a new analysis published by the Denver Post.

The newspaper studied federal and state crash data as well as county coroner reports since 2013. The shifting trend in fatal-crash drug test results seems to correspond with the state’s legalization of recreational marijuana use. In November 2012, Colorado voters approved a ballot measure that made recreational marijuana legal for adults 21 and older. Retail sales began in January 2014.

Ad Loading...

The Post analysis does come with a noteworthy caveat: Positive test results for marijuana don’t conclusively prove that the driver was high at the time of the crash. Someone can test positive for the drug days or even weeks after using it.

Nonetheless, the numbers are eye-opening.

From 2013 to 2016, the state saw a 40% jump in the number of all drivers involved in fatal crashes — from 627 to 880, the Post reported. From 2013 through 2015 (2016 data aren’t yet available), the number of drivers who tested positive for alcohol after a fatal crash rose 17% — from 129 to 151. But the number of drivers testing positive for marijuana after a fatal crash leaped 145% — from 47 in 2013 to 115 in 2016.

Photo by Lab Tested/Wikimedia Commons.

In 2013, drivers in fatal crashes tested positive for marijuana about 10% of the time, the Post reported. But by 2016, that figure rose to 20%. In 2015, the average age of drivers testing positive following a deadly crash was nearly 35 years old.

In 2015, Colorado had 547 road deaths. A total of 99 of these fatalities involved drivers who tested positive for marijuana, the newspaper reported, and 187 involved drivers who tested positive for alcohol. Of those, 35 road deaths involved drivers who tested positive for both alcohol and marijuana.

Ad Loading...

Despite the dramatic change in test result trends, the prevalence of driver drug testing didn’t change in any appreciable way during that same period, federal crash data indicated.

What’s more, some drivers didn’t test positive simply because they weren’t drug-tested at all. Not all coroners drug-test deceased drivers for marijuana use; it’s not required by law. And some police agencies don’t bother drug-testing a surviving driver if he or she has a blood alcohol concentration of more than .08% and can be charged with driving under the influence anyway.

Originally posted on Automotive Fleet

More Small Fleet

SponsoredMarch 9, 2026

Boosting Last-Mile Fleet Uptime, Safety, and Value with AI Vehicle Inspections

AI-powered inspections are transforming last-mile fleets by replacing manual checks with highly accurate automated scans that detect defects in seconds. By giving fleet operations visibility into the daily condition of their vehicles, you can identify trends over the vehicle’s lifecycle that enable improved procurement decisions, route management, driver training and accountability.

Read More →
SponsoredMarch 1, 2026

How One Fleet Cut Motor Pool Costs by $45K With Smarter Key Control and Automation

Still managing your motor pool with spreadsheets and manual approvals? Loyola University replaced outdated processes with automated fleet management, eliminating overtime and saving up to $50,000 annually. See how they did it.

Read More →
SponsoredMarch 1, 2026

Artificial Intelligence in Field Service: North America

48% of field service leaders are investing in AI to manage customer communication and self-service. Get the latest on how fleets are using AI and thinking about the future.

Read More →
Ad Loading...
SafetyFebruary 4, 2026

Five Ways Seat Belts Help Prevent Injuries

There are five ways seat belts protect occupants from injuries, according to the Tennessee Department of Safety and Homeland Security.

Read More →
SponsoredJanuary 14, 2026

It’s here: The 2026 Fleet Technology Trends Report

What does AI mean for fleets? Get the answer — and learn other top tech trends.

Read More →
Wreaths Across America graphic highlighting the role of small fleets in delivering wreaths to honor veterans, featuring wreath icons and the American flag.
Small Fleetby Lauren FletcherDecember 8, 2025

Small Fleets, Big Impact: How Independent Drivers Power Wreaths Across America

Check out how small fleets and independent drivers power Wreaths Across America each December and why their impact matters more than ever.

Read More →
Ad Loading...
A stressed person covers their face, illustrating that 65% of small fleet managers handle all operations alone, according to a Vehicle Management Systems (VMS) survey.
Small Fleetby StaffNovember 12, 2025

VMS Survey Finds 65% of Small Fleet Managers Run Operations Alone

A new VMS survey shows small fleet managers are stretched thin, with most handling operations solo and eager to adopt digital tools for relief.

Read More →
Safe Driving on Halloween over spooky fall road
Safetyby StaffOctober 20, 2025

Tips for Driving Safely on Halloween Night

This video features a reminder from the Connecticut Department of Transportation (DOT) and the Connecticut Police Chiefs Association, urging drivers to prioritize safety this Halloween.

Read More →
VMS Co-CEO David Prusinski highlights the company’s AI-powered virtual fleet manager designed to improve uptime and reduce operating costs for fleets.
Green Fleetby Lauren FletcherOctober 6, 2025

AI, Access, and Uptime: VMS’s Next Chapter with David Prusinski

VMS’s new Co-CEO, David Prusinski, shares how an AI-first approach will give small fleets and repair shops the tools to compete like big players.

Read More →
Ad Loading...
Photo of tire tracks and winter scenes.
Small FleetMay 24, 2025

Fleet Managers Share Winter Prep Tips: It's Never Too Early!

Three fleets share best practices to prep vehicles for winter and prevent downtime when the cold sets in.

Read More →