Critics fear that racism could play a role in its enforcement.
Massachusetts has just ruled that if a cop thinks you're driving while high, the best thing you can do is lawyer up.
Michigan has the country’s second highest number of medical cannabis users — and they’re driving on their meds.
The state commission recommends penalties for drivers refusing drug tests and for having open containers of pot. The jury's still out on salvia testing.
Acumen Law takes impaired driving defenses very seriously.
How much does cannabis consumption really affect driving abilities?
The police department in Canada's capital will not be using the newly approved roadside cannabis tests.
Are cannabis breathalyzers the wrong approach to preventing people from driving under the influence?
Lyft is encouraging Massachusetts cannabis consumers to drive sober by offering $4.20 in fare credits for anyone who pledges on social media.
Canada's Attorney General approved the device after an independent panel of experts and pilot program found it to be reliable.