Originally Posted by GUWonder

I wouldn't be surprised if he was targeted due to concerns about leaking or selling "secrets" (or facilitating contacts that may be seeking to be in that market) with regard to one or more Asian country -- perhaps India specifically. Sometimes that is why certain people in the governmental sciences sector with Asian ethnicity and affiliations get selected for such searches.

It is within the realm of the routine for some FBI counter-espionage investigations to use the CBP as a means to further an investigation.