Scientists on 11 September 2011 said they had developed sensors to detect breath and sweat. This device one day could locate survivors buried under buildings hit by an earthquake or a bomb blast.
Dogs can be trained to detect these compounds, but are expensive to train, require frequent rest periods and both animal and trainer are exposed to danger during search operations.
While a device could be used in the field without laboratory support. It could monitor signs of life for prolonged periods and be deployed in large numbers.
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