Fingerprint scans can trace coffee or cocaine - The Times
Wednesday 01 July 2015
The fingerprint reader fires a laser at the fingerprint, which is coated with a chemical, known as a matrix. Under the beam, the substances emit charged particles that can be detected in seconds.
The Home Office-funded device, which is also able to identify gender and even whether a suspect has cancer, can flag up signs of cocaine, heroin or cannabis use within a minute. It is being tested by West Yorkshire police in real investigations.
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The Times Fingerprints (PDF, 58.1 KB)