What is holding up Chen Guangcheng's departure?

What is holding up Chen Guangcheng's departure?

May. 11, 2012
Chen Guangcheng, the Chinese dissident who escaped from house arrest to seek help at the U.S. Embassy, was granted a deal to study law inside the U.S. Scott Pelley spoke with Holly Williams of British Sky News to find out what is delaying his departure.
CBS News
Correction: Clarification: