Making marijuana into a legitimate business

Cannabis has been legal for recreational use in the US states of Washington and Colorado for more than a year now.

Voters have also backed legalisation in Alaska and Oregon, and are facing a new challenge - how to turn an illegal drug into a legitimate business.

Alastair Leithead has been to Seattle - to see how legal cannabis is going, and over the border to Salem, Oregon - to see how they are planning to implement it.

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