Most inmates serving 10+ years in Swedish prisons are drug related cases.
In 2010, the Swedish supreme court decided to dramatically change the policy regarding punishment for drug trafficking. What was previously a 14-year prison sentence suddenly became a 4 year crime. [Update: Prisoners sentenced in 2010 would previosly have been staying in prison for 10+ years but after the change they are now released in 2013 for good behaviour.]
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