Thin Blue Line Flag
FILE - In this July 28, 2016, file photo, a flag with a blue and black stripes in support of law enforcement officers, flies at a protest by police and their supporters outside Somerville City Hall in Somerville, Mass. San Francisco's police chief said the city's rank and file will wear neutral face coverings to defuse a controversy that was sparked when officers sent to patrol a May Day protest wore masks adorned with the "thin blue line" flag. (AP Photo/Charles Krupa, File)
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The edict came down last Friday from SFPD Chief Bill Scott after officers generated controversy when they were seen wearing the masks at a May Day protest by homeless activists at an abandoned property.
