Some Montreal landlords are banning the use of cannabis in their rental units.
City officials and police have now sent 64 warning letters to landlords telling them to shutter pot storefronts.
A lawful San Jose dispensary has been ordered to vacate in latest federal crackdown to challenge state laws.
Three medical marijuana shops in the Wenatchee area have closed after federal prosecutors threatened to seize the properties and to fine or prosecute the landlords.
Federal prosecutors are targeting medical marijuana shops in California, seeking forfeiture of the properties in which they do business.