Hair could already be screened for drug metabolites, allowing investigators to track a subjects (1) history of drug (ab)use. Now, hair samples could also be used to track said subjects whereabouts throughout time.
Studying the compositions of a trees annual rings allows scientists to determine the composition of the soil as well as other enviromental factors. Human hair also absorbs certain agents from it's enviroment. By analysing the exact composition of a hair, and comparing it to reference samples taken at a location, it is now possible to determine when someone has spent time at a certain place, and for how long.
This new technology is of course being touted as a crime-fighting tool, as well as a means of screening people applying for political asylum.
1: ambiguity intended
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