It's been a year since Colorado became the first state in the US to legalise marijuana, and its impact on health, crime, employment and other factors can now be more empirically measured.
So, did it bring about an apocalypse leaving the streets strewn with out-of-work addicts as some Republicans feared?
"We found there hasn't been much of a change of anything," a Denver police officer told CBC this week.
"Basically, officers aren't seeing much of a change in how they do police work."
Not only has the legalisation of cannabis not come with a rise in crime, it has also created thousands of jobs, as tourists flock to the city's 60+ marijuana outlets.
A local newspaper even appointed its first cannabis critic in April.
"So the sky isn't falling?" a CBC reporter asked the officer. "The sky isn't falling," he replied.
Impaired driving, property crime and violent crime were all dropping in Denver prior to legalisation, and the trend has only continued. Even drug use among young people is down, the report claims.
Colorado's unprecedented move was replicated in Washington, Alaska and Oregon and this week a bill was filed to legalise it in New York.
Cannabis remains a Class B drug in the UK, carrying a prison sentence for possession of up to five years.