Apparatus for sealing a gap formed between the floor or other supporting surface and the base of a vending machine, which apparatus prevents the accumulation of debris, etc. A next step includes measuring a transmit power. If the tap connection is already in place, pre-hand-off actions taken at the target exchange trigger an analysis of whether law enforcement agency monitoring of that communication is lawfully authorized with respect to the target exchange followed by instructing the anchor exchange to terminate the tap connection at hand-off if monitoring is not lawfully authorized. The incident light exits through the second surface. The chalk line tool can be manufactured with the handle or can be retrofit with parts which are supplied as a kit.