The Arizona Chamber of Commerce and Industry has joined with leaders across the state to try to stop a group from getting a recreational marijuana initiative on the ballot this fall.

A complaint filed in the Superior Court of Arizona claims marijuana backers used fraudulent and misleading materials to convince Arizona voters to sign a petition to get the measure on the ballot.

Joseph A. Kanefield, a partner and election attorney for Ballard Spahr, said the plaintiffs appear to have an uphill battle.

Courts won't hear challenges to the substance of a proposed initiative until after an initiative passes, unless there's some fraud, confusion or unfairness that resulted from the proponents' efforts,

Kanefield said.

"It's not clear to me they will be able to meet the burden," he said. "Arizona has a strong policy of supporting the people to exercise the initiative power."