A federal district court has held that firing public school teachers based on the results of a secret algorithm is unconstitutional. The case, Houston Federation of Teachers vs. Houston Independent School District, concerned a commercial software company's proprietary appraisal system that was used to score teachers. Teachers could not correct their scores, independently reproduce their scores, or learn more than basic information about how the algorithm worked. "When a public agency adopts a policy of making high stakes employment decisions based on secret algorithms incompatible with minimum due process, the proper remedy is to overturn the policy," the court wrote. EPIC recently filed a complaint asking the FTC to stop the secret scoring of young tennis players. EPIC has pursued several cases on "Algorithmic Transparency," including one for rating travelers and another for assessing guilt or innocence.