The invisible sentry : Radiological imaging in terror and terror prevention.

Radiological imaging may enable the recognition and documentation of acts of terror. Search by X-rays can assist in the detection of weapons, drugs, contraband, and hidden persons. Fluoroscopy, backscatter imaging, and computed tomography are being employed for the evaluation of luggage, humans, trucks, and containers. The identification of drugs and explosives is possible by additional spectral analysis. The images can show individuals nearly naked, which may lead to a discussion on violation of privacy and dignity. There are, however, clinical questions raised about the exposure to X-rays and the possible absence of informed consent. Finally, although the use of X-rays is part of terror prevention, it has been part of the terror, too. The Stasi, the secret service of the German Democratic Republic, used diagnostic X-rays and ionizing radiation in order to control opponents of the political system.