Florida U.S. District Judge Mark Walker recently ruled in favor of plaintiffs in a 2013 lawsuit, filed by seven teachers and their unions, which challenged the state's teacher evaluation practices. The system, according to the Washington Post, evaluated teachers on the basis of student test scores. 

Walker said the practice was "unfair."

"This case, however, is not about the fairness of the evaluation system," Walker wrote. "The standard of review is not whether the evaluation policies are good or bad; wise or unwise; but whether the evaluation policies are rational within the meaning of the law. The legal standard for invalidating legislative acts on substantive due process and equal protection grounds looks only to whether there is a conceivable rational basis to support them."

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