A safety fastener for capturing and concealing an installed communication line on a building surface, comprising: a metallic mounting screw; and an elongated generally flat metallic fastener body having a first opening for passage of the mounting screw, wherein the fastener body has a distal end configured to capture a communication line previously installed along a building surface via an adhesive or other non-metallic fasteners; characterized by a fastener cover including: a cover body having an open top, and a bottom wall having a second opening for alignment within the first opening in the fastener body when the cover body is disposed over the fastener body, wherein the mounting screw is inserted through the open top of the cover body, the second opening in the bottom wall of the cover body, and the first opening in the fastener body to mount the fastener body and the cover body together on the building surface at a position where the fastener body captures the installed communication line and thereby prevents the line from collapsing and interfering with responders if the adhesive or other non-metallic fasteners fail during a building fire or otherwise; and a cap for closing the open top of the cover body, wherein the cover body and the cap are dimensioned and arranged to conceal the fastener body and the mounting screw when the cap is at a closed position; and wherein the cap has an integrally formed distal portion that extends in an opposite direction from the cover body when the cap is closed on the top of the cover body, and the distal portion of the cap is constructed and arranged so that the installed communication line can pass inside the distal portion, and the communication line is concealed at the distal end of the fastener body when the cap is closed. a metallic mounting screw; and an elongated generally flat metallic fastener body having a first opening for passage of the mounting screw, wherein the fastener body has a distal end configured to capture a communication line previously installed along a building surface via an adhesive or other non-metallic fasteners; characterized by a fastener cover including: a cover body having an open top, and a bottom wall having a second opening for alignment within the first opening in the fastener body when the cover body is disposed over the fastener body, wherein the mounting screw is inserted through the open top of the cover body, the second opening in the bottom wall of the cover body, and the first opening in the fastener body to mount the fastener body and the cover body together on the building surface at a position where the fastener body captures the installed communication line and thereby prevents the line from collapsing and interfering with responders if the adhesive or other non-metallic fasteners fail during a building fire or otherwise; and a cap for closing the open top of the cover body, wherein the cover body and the cap are dimensioned and arranged to conceal the fastener body and the mounting screw when the cap is at a closed position; and wherein the cap has an integrally formed distal portion that extends in an opposite direction from the cover body when the cap is closed on the top of the cover body, and the distal portion of the cap is constructed and arranged so that the installed communication line can pass inside the distal portion, and the communication line is concealed at the distal end of the fastener body when the cap is closed. a cover body having an open top, and a bottom wall having a second opening for alignment within the first opening in the fastener body when the cover body is disposed over the fastener body, wherein the mounting screw is inserted through the open top of the cover body, the second opening in the bottom wall of the cover body, and the first opening in the fastener body to mount the fastener body and the cover body together on the building surface at a position where the fastener body captures the installed communication line and thereby prevents the line from collapsing and interfering with responders if the adhesive or other non-metallic fasteners fail during a building fire or otherwise; and a cap for closing the open top of the cover body, wherein the cover body and the cap are dimensioned and arranged to conceal the fastener body and the mounting screw when the cap is at a closed position; and wherein the cap has an integrally formed distal portion that extends in an opposite direction from the cover body when the cap is closed on the top of the cover body, and the distal portion of the cap is constructed and arranged so that the installed communication line can pass inside the distal portion, and the communication line is concealed at the distal end of the fastener body when the cap is closed.