Officials carried out searches at eight homes and one business in Montreal, Longueuil and Carignan starting at 8 a.m. on Thursday.
Richer said investigators confiscated narcotics as well as Canadian cash and a firearm.
Montreal police Const. Danny Richer said officers believe the locations are a part of a drug distribution network.
Richer said investigators are meeting with 12 individuals who were detained by officers during the searches.
Richer said the raids are a part of an ongoing investigation.