A system is provided for distributing pesticide into the interior walls of a building includes an injection port in a wall of a building, connected to a manifold to which a large number of flexible tubing members, having discharge openings spaced along the length of the tubing members, are attached. The sensing structure for physiological signals includes a flexible substrate, a piezoelectric sensing structure and a damping structure. As a pet reclines on the upper, permeable layer, the anti-flea agent diffuse from the insert, through the permeable layer and onto the supine animal.