City police unions tried to persuade a panel of federal judges Wednesday that they had a right to appeal a ruling that the New York Police Department’s use of the policing tactic known as stop-and-frisk was unconstitutional.

Attorneys argued before the Second U.S. Circuit Court of Appeals that the unions had legal standing to join an appeal of a decision by U.S. District Judge Shira Scheindlin last year. Her decision ordered changes to the NYPD as well as an independent monitor for the department.

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