Medical marijuana cannot be sold through private shops, the Michigan appeals court said Wednesday in a major decision that strikes at businesses trying to cash in on pot and cuts off a source for people with chronic ailments.

A three-judge panel said the 2008 medical marijuana law, as well as the state's public health code, does not allow people to sell pot to each other, even if they're among the 99,500 who have state-issued marijuana cards.

The court said Compassionate Apothecary in Mount Pleasant, Mich., can be immediately shut down as a "public nuisance." The 3-0 decision means local authorities can pursue similar businesses, estimated at 200 to 300, in their communities.

It was not immediately clear whether they would, but state Attorney General Bill Schuette said he's notifying all 83 county prosecutors.

"This ruling is a huge victory for public safety and Michigan communities struggling with an invasion of pot shops near their schools, homes and churches," Schuette said in a statement. "The court echoed the concerns of law enforcement, clarifying that this law is narrowly focused to help the seriously ill, not the creation of a marijuana free-for-all."

Of course, not everyone shares that view. Chuck Ream, president of an Ann Arbor shop, called the ruling an "assault on democracy" nearly three years after voters approved marijuana as a way to relieve pain or other medical problems. He estimates that one-third of people with marijuana cards get pot through dispensaries, with others growing their own or getting it through a registered caregiver.