The justices on Tuesday accepted jurisdiction of appeals from conflicting lower court decisions.
At stake could be millions of dollars in fines collected across the state. They may have to be refunded if the justices side with the 5th District Court of Appeal.
The city of Orlando is appealing the Daytona Beach-based court's ruling that fines collected before the law was passed in 2010 were illegal.
The 3rd District Court of Appeal in Miami came to the opposite conclusion in upholding fines collected by the city of Aventura.
The cases will not affect motorists ticketed after the law was passed.
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