Francois-Philippe Levan, 42, was yesterday found guilty of pocketing seized drugs, tipping off criminals to police investigations and illegal wire taps.
The former head of Corsica's elite investigations unit in the port city of Bastia before being promoted to a post on the French Riviera, Levan -- who was nicknamed "The Chinaman" for his Vietnamese heritage -- left the police force in 2010 as charges piled up against him.
He drew attention with his lavish lifestyle, driving a Porsche and buying a luxury villa in southern France.
An investigation into a racketeering ring on Corsica suggested he provided information to a suspected mafia member.
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Among them, the prosecution said he signed false documents vouching that 100 kilos of seized cannabis resin had been destroyed when in fact he allegedly removed the drugs from police custody and sold them.
He was acquitted of other charges, including drug-related crimes, corruption and abuse of power.
Levan's lawyers said they would appeal the conviction.