Abstract: In a latch guard which has a mounting flange mountable in overlying relation to the inner face of a jamb in the vicinity of keeper means located on the jamb, and a blocking flange integrally fixed along one edge of the mounting flange substantially at right angles thereto, the improvement wherein a portion of the blocking flange projecting along and beyond the full length of a recess formed in the mounting flange in a direction away from a door has a plurality of toothed segments formed therein. The latch guard further includes a conductive plate which lies in the second plane paralleling the first plane and is normally spaced therefrom in a direction away from the door. At least one non-conductive compression spring is interposed between the plate and the blocking flange to urge the plate in a direction away therefrom. The stop and the jamb are formed with first and second recesses, respectively to receive blocking flange, the spring and the plate.