A Miami police officer looks at a driver’s license he requested from a motorist at a DUI checkpoint.
AP Photo/Lynne Sladky
We have a reliable and easy-to-use test to measure blood alcohol concentration. But right now we don't have a fast, reliable test to gauge whether someone is too doped up to drive.
Cannabis is on display at Shango Premium Cannabis, in Portland, Oregon, Sept. 30, 2015.
Timothy J. Gonzalez/AP
The trend toward marijuana legalization is growing, but the legality, or illegality, of cannabis at the federal level hasn't changed at all.
There is incredible variation between strains of cannabis plant.
AAP Image/QLD Police
The Australian government will now accept licence applications for groups wanting to grow cannabis for scientific and medical purposes. But there's still a lot we don't know about this complex plant.
Millions of Americans in nine states will vote on Nov. 8 for the right to do this.
Robert F. Bukaty/AP
Nine states are deciding whether to legalize marijuana. Yet the drug's prohibition at the federal level has created an unstable financial environment for producers and retailers.
A variety of medical marijuana strains are seen at a dispensary in Denver in 2011.
With restrictions to cannabis loosening at the state level, research is badly needed to get the facts in order.
There is strong evidence that cannabis is useful for treating a range of conditions. Legalising small-scale cultivation is a start to helping those in need.
Legalisation of cannabis for therapeutic use is happening slowly in Australia.
Cannabis has a long history, and its misuse hangs over it like a dark shadow.
Monkey Business Images/Shutterstock
A new study found that people who are high on cannabis are less likely to opt for a task with a larger reward if the task requires more effort.
But is the data misleading?
Sea of Green Farms in Seattle, Washington.
An era of prohibition may soon be over for marijuana, and powerful players are watching. A legal expert explains how smaller, local producers can keep their pot in the game.
In some states this is medical marijuana.
The phrase 'medical marijuana' might give you the image of people buying plants or dried marijuana to smoke. But that's not always the case.
One in three adults have smoked pot at some point in their lives.
The potential harms associated with using cannabis depend, above all others, on two things: the age at which you first begin to use cannabis and the frequency, dose and duration of use.
Packets of synthetic cannabinoids illegally sold in New York City.
Synthetic cannabinoids – drugs that mimic the psychoactive effect of cannabis – have been linked to injuries and deaths. And when one is banned, another rises to take its place.
Men are more likely to use cannabis because of external factors such as peer use, and women for internal factors such as anxiety.
Cannabis is the most widely used illicit drug with more than 181 million consumers worldwide, three quarters of whom are men. Why do men and women use cannabis?
Addiction isn’t just about how much of a drug you take. It’s also about how you take it.
Drugs via www.shutterstock.com.
The way you take a drug affects how much of it gets to your brain, and how rapidly drug levels rise and fall.
Throughout history, most people have used marijuana to escape the toils of everyday life.
'Joint' via www.shutterstock.com
For over 500 years, the drug has been associated with racism and poverty.
Heavy cannabis use is consistently associated with poorer attention and memory, and increased rates of metal health problems.
The legislative changes poised to increase the availability of cannabis are outpacing our understanding of the impact that the drug has on the brain.
The three states will collaborate on the development of medicinal cannabis, its regulatory framework and clinical research.
Queenslanders and Victorians with particular chronic illnesses will be eligible to join New South Wales medicinal cannabis trials, due to start mid next year.
Chris Christie has vowed to ‘crack down’ on marijuana if elected president.
The myth has been debunked time and time again.
Easier access to marijuana doesn’t necessarily lead to more addicts.
Image of person smoking via Stanimir G.Stoev/Shutterstock
At present, cannabis is fully legalized in Colorado and Washington and will soon be fully legalized in Oregon and Alaska. Additionally, medical cannabis is legal in 23 states. The writing is on the wall…