One of the most difficult problems to solve in security technologies in the ability to know whether a person holds or a vehicle contains explosives. As we discuss standoff technologies today let's first make sure that we are talking about the same thing.

Remote detection technologies allow personnel to respond to the threat of a suspicious object by taking a sample or a 'sniff' up close. This affords the luxury of getting results from a safer, remote distance. These remote detection technologies are not the technologies we'll talk about today. While very important, today we are looking at situations where both the responder and the technology are removed from the situation.

There are many options in designing a standoff detection system. Should the sensor sniff for chemicals (in any stage of life) or should it rely on detecting different parts of the bomb such as wires or triggers. Also should it be ground based system or what about an air borne platform?

Last month TSWG posted requirements of its explosives subgroup. Their requirements should be a good benchmark for what standoff detectors should meet if they will bring innovation to this area. Here are the goals listed for explosive detection in vehicles: