The fundamental difference between the perpetrator of a terrorist act or crime and an innocent person is that the perpetrator, having committed the crime, has specific knowledge of the crime stored in his brain. An innocent suspect does not. Similarly, a terrorist mastermind or trained terrorist has specific terrorism-related knowledge stored in his brain. This is what iCognative testing detects, scientifically and accurately. Words, phrases, or pictures relevant to a terrorist act, crime, terrorist training, or specific knowledge or expertise are presented on a computer screen, in a series with other, irrelevant words, phrases or pictures. A suspect’s brainwave responses are measured non-invasively using a headset equipped with EEG sensors. A proprietary computer program then analyzes the data to determine if the crime-relevant information is stored in the brain. A specific “P300” brain response is emitted by the brain of a perpetrator who has the details of a crime stored in his brain, but not by an innocent suspect lacking this record in his brain. This is proven by extensive peerreviewed, published scientific research.