By taking just a quick swab of the chemical residue on a smartphone, scientists at the University of California, San Diego, could construct a lifestyle sketch of the phone's owner, including his or her diet, health status, locations visited and even preferred hygiene products.

The researchers said they see a range of possible uses for such an analysis, from criminal profiling and forensics to health studies that monitor a person's exposure to toxins or adherence to a medicine ......

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