Fingerprints can help identify you, but they can also spot if you are a smoker, drink coffee, take drugs, or have  handled explosives. Fingerprints are made up of oil and sweat, and these carry traces of drugs, including nicotine and caffeine. Tiny particles with antibodies attached, or hi-tech laboratory techniques, can spot and highlight these traces, or find very small amounts of explosives.

Read the abstract in Angewandte Chemie.

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