A new technology may be able to track people's movements by detecting evidence of their diet in their hair

A new technology may be able to track people's movements by detecting evidence of their diet in their hair:

"A group of researchers from the LGC Chemical Metrology Laboratory in the UK havs teamed up with the University of Oviedo, Spain. Together they have developed a 'laser ablation' method that makes it possible ‘to detect variations in the sulfur isotopes of a single hair over time’, says Science Daily. This means that scientists will be able to track a person’s movements between different countries, as the sulphur isotopes reveal changes in eating habits. "