Tracing Explosives And Fish With Chemical Tags

Researchers at the University of Oviedo (Spain) have come up with a way of tagging gunpowder which allows its illegal use to be detected even after it has been detonated. Based on the addition of isotopes, the technique can also be used to track and differentiate between wild fish and those from a fish farm, such as trout and salmon...

Source: http://www.medicalnewstoday.com/releases/240311.php

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