Newswise — Whatever the suspect's outward answer, the brain will always answer honestly. And it is this internal answer that Brain Fingerprinting reveals. With the right questions, it is possible to detect records in the brains of terrorism suspects of crimes committed or crimes in the planning.

During the 30-minute test, the suspect is presented with words, phrases and images, some of which may be pertinent to a specific terrorist group or gang. The resulting brain waves are measured using electrodes. If the suspect recognises any information, his brain will produce a mermer, a characteristic increase in neuron activity only seen in response to familiar information.

The same test can be used to monitor declines in memory and cognitive functioning in patients with Alzheimer's and other brain disorders.

The test has been judged scientifically rigorous enough to be admissible in court in the US. Already it has been used to trap a serial killer and free a man jailed for a crime he says he did not commit.

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