The Los Angeles County Board of Supervisors voted Tuesday to advance an ordinance that would ban all law enforcement officers, including federal agents, from wearing masks or concealing their identities while on duty. Proposed by Supervisors Janice Hahn and Lindsey Horvath, the measure aims to address what they call unreasonable law enforcement tactics used during immigration enforcement operations. The motion passed 4 to 0, with one abstention, and will face a second vote on Dec. 9. If approved