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These security measures, however, were not designed for scenarios in which individuals appear in an open environment and a security decision must be made at a distance from the suspected explosive. For scenarios such as these, explosives detection is required, where physical separation puts individuals and vital assets outside the zone of severe damage should an explosive device detonate. The difficulty of the explosive detection task is exacerbated by several factors, including dynamic backgrounds that can interfere with the signal from the explosive, the potential for high false alarms, and the need to ascertain a threat quickly so that action can be taken.