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Scientists anywhere needing to identify an animal, plant, fungus or other organism would simply take a DNA swab and compare it with the library's records.
People using the hand-held device would brush a strip of paper over a biological sample from the species being identified. The paper would then be inserted into the device.
The device could reveal the source of food contamination. "A mouse head was recently found in a TV dinner in Canada. We were able to show it came from South-East Asia."