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Sulphur in just one hair could blow a terrorist's alibi
Date:5/27/2009

ths in Croatia, Austria, the United Kingdom and Australia.

"We are what we eat, and the small variations in the 34S/32S relationship reflect changes to our diet, which can in turn be related to movements from one country to another", Justo Giner, another of the study's authors, tells SINC. In addition, as hair grows an average of 1.25cm per month, the data obtained from a hair measuring between 4cm and 6cm can provide information about its owner's activities in the months leading up to the sample being taken.

The results of the experiment revealed that the traveller's hair indeed showed significant variations in the sulphur isotopes, while changes in the hairs of the two people living in the United Kingdom were minimal, and similar in both samples.

The authors believe they have overcome "the first hurdle" developing an effective method to measure longitudinal isotope variations in hair, with the potential to relate these changes to geographical movements. The next objective is to demonstrate the global significance of these variations, and they are already working with hair samples from 150 volunteers with different diets and geographical origins in order to move forward in this area. In addition, the researchers will also measure the isotopic variations of other elements apart from sulphur in their study, for example carbon and nitrogen.

The scientists are confident they will be able to create databases that will one day make it possible to link the relationship between a specific isotope in hair keratin and a country or region, which would be of great help to the police in tracking down international criminals.

"Although we still cannot say that a certain isotopic variation in a person's hair shows that he or she has been in a particular country, the method can help to break down the alibis of some terrorists who claim not to have moved over recent months", says Santamara-Fernndez.

Various British security
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Contact: SINC
info@plataformasinc.es
0091-425-0909
FECYT - Spanish Foundation for Science and Technology
Source:Eurekalert

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