The Sochi Winter Olympics are a major international event, costing billions of dollars to put on and showcasing the finest athletes from 88 nations. According to the New York Times, visitors to Sochi are electronically screened by a "sophisticated system that gauges emotional state in an effort to identify potential terrorists. The system, developed by Elsys Corporation, a Russian company based in St. Petersburg, uses computer analysis of live video images to measure tiny muscle vibrations in the head and neck known as vestibular-emotional reflexes. Called VibraImage, the system is part of the effort by the Russian government to protect the Olympic Games."

This is what Elsys, the Russian company behind VibraImage, promises:

VibraImage technology registers micromovement (vibration) of person by standard digital, web or television cameras and image processing. Human head microvibration is linked with the vestibular-emotional reflex (VER) and depends on  emotions level. VibraImage system detects human emotions by control of 3D head-neck movements accumulated in several frames of video processing. Vibraimage - system that can do anything in human detection!