Suspicious activity reporting (SAR) links the observations of law enforcement personnel around the nation it is a policing strategy to increase the role of state and local law enforcement. SAR provides police with an understanding of the nexus between criminal activity and terrorism.
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Author Amit Katwala says in his new book, Tremors in the Blood, that for all the immense harm they can cause, lie detectors, or polygraphs , are not and never have been reliable.
For as long as we have been human we have looked for some way of telling when we are being told the truth. We tried dunking witches, only to find that buoyancy is not connected to the supernatural. We tried torture, but discovered that people will eventually say just about anything to make it stop.