U.S. Customs and Border Patrol agents at Detroit Metro sent a traveler back to China after the passenger initially claimed he was not carrying any prohibited items. A subsequent inspection found armor and tactical apparel. Federal Agents also searched the residence of the traveler and found “a significant cache of firearms and other regulated paraphernalia”.

I don’t understand how he could be sent back, the article says the traveler had a residence where they found a lot of firearms. Maybe he is on a student visa? Most likely, this individual was just a fan of guns – as private gun ownership is prohibited in China, he probably enjoyed being able to collect firearms here in the US. Given the high-profile mass shootings, the CBP agents are probably being extra cautious.