A federal appeals court decision on Friday will allow the Los Angeles Police Department to enforce a rule aimed at curbing corruption among narcotics and anti-gang police officers by enforcing them to disclose personal financial information.

The 9th U.S. Circuit Court of Appeals denied a motion by the Los Angeles Police Protective League to halt the requirement. The court's order upholds a ruling last year by a federal judge who said there was no proof that blocking the plan would benefit the public.

The police union, which filed the motion after the department announced it planned to implement it last June, warned that such requirements would drive away experienced officers, hurt morale and disrupt recruiting.

The financial disclosure plan was mandated by the U.S. Department of Justice after a scandal in the late 1990s involving misconduct by anti-gang officers from LAPD's Rampart division.

The Police Department said the appeals court's decision was expected and plans to implement the rule within 30 days. It will affect about 500 officers.