Nothing will roll. In fact, Dr. Xi won't even receive an apology or acknowledgement that something wrong happened here. He probably can and should sue in this case, as they destroyed his reputation over a "mistake". The government either a) brought these charges due to extreme negligence, or b) brought the case in bad faith, knowing that their case was fatally flawed from the beginning and were looking to use the charges to extort Dr. Xi into cooperating against his Chinese counterparts. Either way, the government is liable for the damages its actions caused.