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HELENA – Marijuana dispensaries will have at least two weeks to prepare for severe rollbacks to Montana's medical marijuana law, though most will likely have to shut down, the head of an advocacy group that tried to block the restrictions said Friday.

On Thursday, the Montana Supreme Court upheld nearly all of the provisions of a 2011 state law to roll back much of the 2004 voter-approved initiative that legalized medical marijuana.

The ruling means that marijuana providers can sell to no more than three registered users each; doctors who recommend the drug to more than 25 patients in a year will be automatically reviewed; and marijuana advertising will be banned.

The ruling does not take effect until the judgment is formally entered in district court, which won't happen before March 10, Supreme Court clerk Ed Smith said. That could be delayed further if the plaintiffs who sued to block the 2011 law ask the court for a re-hearing of the case.

Mort Reid, president of the lead plaintiff Montana Cannabis Information Association, said he doubted such a request would change anything.