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U.S. Department of Agriculture (USDA) Agricultural Research Service (ARS) displays modified over-the-counter items that use ultraviolate lighs, video camera, and a smart device transmitter to provide quick identification of various chemical and biological elements at the 4th USA Science & Engineering Festival at the Walter E. Washington Convention Center, in Washington D.C, on Sunday, April 17, 2016. U.S. Department of Agriculture (USDA) is a sponsor of and exhibitor at USASEF. Multiple USDA age