The California Supreme Court decided Monday that cities may ban medical marijuana dispensaries through zoning.

The state high court’s unanimous ruling,  which approved a ban by the city of Riverside, is expected to spur more such prohibitions around the state. About 200 communities now have zoning laws that exclude cannabis dispensaries.]

During a hearing in February, several justices indicated they favored upholding city bans. The justices' comments suggested the court would rule that local governments have wide policing powers that state medical marijuana laws have not usurped.