Baltimore City Detention Center

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FILE - In this Nov. 14, 2013 file photo, a corrections officer works at a security post at Baltimore City Detention Center in Baltimore. Maryland Gov. Martin O'Malley planned to unveil a new cellphone security system Friday, Feb. 7, 2014, at the Baltimore City Detention Center. The technology automatically blocks calls from all cellphones inside the building, except a small number of phones assigned to employees. It also allows any phone to call 911. (AP Photo/Steve Ruark, File)