Chinese authorities are reportedly installing surveillance software on the phones of tourists coming in over certain border crossings.  

The New York Times is reporting that border officials in Xinjiang will install an app called Fengcai onto travelers' Android devices.  Travelers with Apple phones reported seeing Chinese border guards plugging a USB cable in the back of the phone.  It is believed the app searches the phones for 73,000 different files.  Many are related to Islamic extremist groups, including publications from ISIS and images of executions.

But it doesn't stop there.  The files the app targets are also segments from the Quran, portions of an Arabic dictionary, a photo of the Dalai Lama, and - most puzzlingly - a song "Cause and Effect" by the Japanese heavy metal band Unholy Grave.  It's not clear why Chinese authorities are concerned about this song.

This is going on as China has turned large portions of Xinjiang region into reeducation camps, where ethnic Uighur Muslims are being "taught" how to be good Chinese citizens.  This follows years of increasing hostility towards Beijing by certain Uighurs who demand autonomy.  

"The Chinese government, both in law and practice, often conflates peaceful religious activities with terrorism," said Maya Wang, a researcher at Human Rights Watch.  "You can see in Xinjiang, privacy is a gateway right: Once you lose your right to privacy, you're going to be afraid of practicing your religion, speaking what's on your mind or even thinking your thoughts."