Biological intelligence is another method of intelligence collection that is widely used worldwide. The use of biological intelligence has two principle purposes. First, biological intelligence is carried out to identify disease-causing microorganisms and to trace the actual source of disease outbreaks. Intelligence agencies have recognized that analysis of biological signatures can help to track the source of disease outbreak. The best example where biological signatures have been used to trace the outbreak of disease is in 2001 when the United States postal system was attacked using anthrax. The anthrax was identified through thorough cataloging of biological signatures. Second, biological intelligence is carried out to identify manufacture or use of biological warfare agents. Manufacture or use of biological warfare agents can be detected immediately by obtaining biological signatures such as blood and tissue samples.
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