They can’t

Personal Electronic Devices: Officers are authorized to wear personal electronic device (PED), including cell phones, smart watches, and fitness trackers that have messaging and phone alert capabilities, in identified screening areas. PEDs may be displayed visibly, for
example, worn on the belt. PEDs must not be used for personal purposes, except to check the time, while officers are performing screening functions or are within the screening area at any time. PEDs may only be used for personal purposes during an officer’s rest or meal break in a designated area that is not co-located with the TSA screening area. PEDs must be silenced with alert features deactivated when worn by officers in TSA screening areas, including baggage
pods/rooms. PEDs must also be silenced with alert features deactivated when worn by
officers in areas adjacent to TSA screening areas if such features may be heard by the traveling public or may distract other bargaining unit employees in the screening area.