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Researchers have concerns that brain scans - already used in some death row trials in the US - could be used by British police to determine whether a suspect is lying, or has planned a crime they have yet to commit. Dr Burkhard Schafer, of the University of Edinburgh, will say that if left unregulated, scanners could threaten people's privacy. They could, for instance, be used by employers to test the honesty of an individual's CV or by commercial companies to analyse the subconscious preferences of their consumers.
Experts from around the world will gather at the Institute for Advanced Studies in Glasgow today (Monday) to debate the issue.
Researchers also warn that scans could reveal undiagnosed brain conditions in some individuals, causing unnecessary anxiety to them and their families, and that repeated scanning might even carry health risks.