Sounds like the FBI was wrong in this instance.   I do think however that there is very good reason that the Chinese have come under close scrutiny  as a number of them have been involved in 
funneling technology and information to the ChiComs either because they were paid or out of loyalty to their home country.  Much of China's rapid development in missile, satellite, and  stealth technology is 
believed to have been stolen by Chinese spies and moles.