Researchers at the LGC Chemical Metrology Laboratory and the University of Oviedo in Spain have developed a technique to track a person’s movements between different countries using a sample of their hair:
The two most abundant sulphur isotopes in hair keratin are sulphur-32 (32S), which accounts for about 95 per cent, and sulfur-34 (34S), which makes up around 4 per cent. These proportions, however, vary according to people’s diets, and, unless they take their food with them, will therefore change when people travel.
Although this is described in terms of counter-terrorism, there is no reason why it couldn’t be used for anyone and everyone.
Police organizations, including the Metropolitan Police in London, have already shown interest in the technology.
So here is yet another way by which we can be tracked and our movements monitored.