RCMP seized a large amount of marijuana while investigating a suspected grow operation in Saskatchewan last week.
On Friday, police executed a search warrant in the RM of Medstead.
Turtleford RCMP said marijuana plants, packaged marijuana, cash and firearms were seized.
Police arrested 44-year old Cory Graham, 34-year old Melanie Boulette and 43-year-old Oscar Gutierrez-Reyes.
Gutierrez-Reyes is from Ontario and the other two are from Medstead.
They have been remanded into custody and are expected to appear in North Battleford provincial court on Monday.
Police said additional charges will be laid for various firearm-related offences as they continue to investigate.