AdvertisementThe Fine Line Between Countering Security Threats And Racial ProfilingAugust 16, 2016Mary Louise KellyfacebookEmailXiaoxing Xi, a Temple University physics professor, speaks in front of a photo of Sherry Chen, a federal government worker, at a September 2015 Washington, D.C., press conference about the spying charges against them that were dropped. Xi says his wife and daughters were marched out of their bedrooms at gunpoint when he was arrested in May 2015. (AFP/Getty Images)