These have been used in laboratories (even by NASA) to detect trace chemicals, but they are now being applied to the food industry in the effort to monitor food at its most refined level.

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Its invocation would provide crusading NGOs, bloggers and activist journalists with an unchecked justification for rejecting almost any processed food, especially those made using genetic modification or where trace chemicals can be found in food packaging.

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Dr Sharma said the new seed has no trace of any of the natural chemicals which cause a narcotic effect - namely, morphine, codeine and narcotine.

BBC: Addictive-free poppy seed developed

This, he believes, will make it possible to work out which country, even which factory, supplied the original chemicals for the mustard gas - it will not be possible to trace the source of the nerve agents.

BBC: Magazine

Scientists have used chromophores for decades to detect chemicals, but, until Fido, they weren't sensitive enough to detect trace explosives because each molecule of TNT vapor would switch off just a single chromophore, with the result that faint wisps of evil chemicals caused no visible change in luminosity.

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