China's 'Perfect Police State' That Monitors Uyghurs; Invasive Vines Take Over Trees

We speak with investigative reporter Geoffrey Cain who writes about the Chinese surveillance of the Uyghur ethnic minority in western China. He writes about the sophisticated technology and a so-called predictive policing system in his new book, "The Perfect Police State." And, trees in neighborhoods all over the mid-Atlantic U.S. are being choked by fast growing, non-native vines. As Jacob Fenston of WAMU reports, a new study says freeing trees from these invasive vines is an essential tool to fight climate change.