Contra Costa moves to further restrict medical pot

MARTINEZ — Contra Costa supervisors are poised to further tighten the county’s medical cannabis rules in a bid to keep regulatory control from shifting — even temporarily — to Sacramento.

The supervisors expressed unanimous support for an upcoming urgency measure that would establish an unambiguous ban on the cultivation and delivery of medical cannabis in unincorporated Contra Costa County; a move that would likely face fierce opposition from medical cannabis advocates.

Without the new restrictions, county staffers said that authority to…