ROBERT BROOK / SCIENCE PHOTO LIBRARY ROBERT BROOK / SCIENCE PHOTO LIBRARY
Sign warning potential criminals that they will be forensically tagged. This is a new technology involving the use of a unique encrypted molecular taggent, a substance that links those committing crimes to the scene of crime. It can be applied to surfaces or used in sprays. The substance, visible under UV light, has a unique molecular signature. Photograph taken in Birmingham, UK.
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