County Supervisor Janice Hahn speaks at a news conference outside the county Hall of Administration Dec. 2, prior to the Board of Supervisors voting to prohibit federal immigration agents from hiding their identities while conducting raids. The item will return to the board Dec. 9 for final action.

Photo by Martin Zamora

Wave Wire Services

LOS ANGELES — The county Board of Supervisors has given preliminary approval to an ordinance that would ban law-enforcement officers from concealing or disguising their identities while on duty in unincorporated areas — a response to federal immigration agents who generally wear masks during their operations.

The proposal, introduced by Supervisors Janice Hahn and Hilda Solis Dec. 2, follows similar efforts at the state and federal levels. If the boa

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