Around 40 officers were involved in the searches.
Three Montreal men — aged 24, 28 and 52 — were arrested and are expected to face charges of possession with intent to distribute and drug trafficking.
They will make an appearance at a Laval courthouse on Friday.
The investigation started in May, according to Laval police.
Two private residences and a business in Laval have been searched so far.
The investigation is on going.