New Scientist wrote a story about the U.S Government making progress on a high tech device called FAST a pre-crime detector - F.A.S.T stands for "Future Attribute Screening Technologies".
The F.A.S.T system is designed to spot "suspicious - devious" people who might be about ready to commit a crime of some type. The scientists behind F.A.S.T say that the early tests are overwhelmingly effective - "We have it at about 78% accuracy on mal-intent detection, and 80% on deception". I'm sure there will be many questions related to privacy issues on this equipment .