Abstract: A self checkout POS system including a security zone; an emitting tower including one or more infrared emitters; a detecting tower including one or more infrared detectors, the detecting tower located on a side of the security zone opposite the side on which the emitting tower is located, the infrared detectors of the detecting tower aligned for reception of infrared radiation emitted by the infrared emitters of the emitting tower; a security shield installed on one side of the detecting tower; and a security shield installed on one side of the emitting tower, the security shield installed on one side of the emitting tower including: a clear acrylic pane; and a polycarbonate film having a matte finish, the polycarbonate film laminated to the clear acrylic pane with an adhesive, the polycarbonate film capable of reducing incident infrared radiation transmitted through and reflected by the clear acrylic pane.