Plamondon is suing for $35 million following his release earlier this year from prison.
He said his 28 years in jail are worth $30 million. He is also asking for $5 million in punitive damages.
Plamondon was convicted of three murders in 1986, but always maintained his innocence.
He was released from prison in January pending a new trial. In April, the new trial was cancelled and he was freed.
His lawyers said police and prosecutors were prejudiced against him because of Plamondon's alleged association with Quebec's drug world.
Defence attorney Daniel Rock said police just wanted to put someone away for the crimes, but that they did not gather enough proof to pin the murders on Plamondon.
He now lives in Quebec City and is not commenting on the case.