As Canada legalises recreational cannabis, what happens to the 500,000 people with existing criminal records for pot possession?

Video by Dan Lytwyn

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The first recreational cannabis to be legally bought in Canada was purchased at midnight on Wednesday (02:30 GMT) on the eastern island of Newfoundland amid queues of hundreds of people.

Canada has become the second country after Uruguay to legalise possession and use of recreational cannabis.

Medical marijuana has been legal in the country since 2001.

But concerns remain, including about the readiness for police forces to tackle drug impaired driving.

Information has been sent to 15m households about the new laws and there are public awareness campaigns.