Jordy's talking about the Sony nitecam. They released the camera (with an IR light) without realizing that the IR sensitivity of the camera (with the filtering the chose) was almost perfectly matched to those frequencies that pass easiest through cloth (within the range of IR frequencies). The gist of which was that it can see through many of the lighter materials (such as cotton, silk, nylon), but not through heavier stuff (like denim). If the material was wet, it worked even better (hence the perverts hanging around swimming pools and the beach). When they realized what they had done, they made a change in the camera. Problem was, the perv community had already figured it out and simply un-did the modification that Sony made. -=>Donald