In a world where explosive, toxic or otherwise lethal substances are, sadly, no longer restricted to theatres of war, but are becoming increasingly common in civilian areas (encountered either by misfortune or misadventure), the ability to detect and identify hazardous chemicals and compounds quickly, easily and at significant range is highly attractive.  Even after a terrorist attack has occurred, significant danger still exists from the threat of further concealed devices, thus significantly impeding the rendering of aid whilst the scene is declared safe.