CNN's Eunice Yoon, reporting from China, investigates how easily counterfeit computer chips, including military grade, are produced and sold in China.

It is one aspect of a growing concern by American government officials about China's incursion into the American national security supply system.  Recently, the head of the House Intelligence Committee launched an investigation into whether a Chinese telecom company, one of the largest in the world, gives the Chinese government access to spy on America.  A recent intelligence community report also called out China for continued efforts to hack into American systems and steal economic and technology information.