Helsinki's District Court says Jari Aarnio was guilty of official misconduct and aggravated evidence tampering.
The court said today that Aarnio, who pleaded innocent, played a key role in importing from the Netherlands nearly 800 kilogrammes of hashish, which was distributed in 2011-2012.
An accomplice, a local top criminal, was also given 10 years. After 30 years on the force, Aarnio was arrested in 2013.
In September, he was convicted of fraud and corruption for an ownership interest in a company that sold surveillance equipment to Finnish police.
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