Zhi Yong Guo

LOS ANGELES—Believing the purchase of 10 thermal imaging cameras went beyond commercial printing applications, FBI agents stopped a pair of Beijing residents at Los Angeles International Airport from boarding a plane to China with the devices and charged them with knowingly attempting to export restricted items without a license. Zhi Yong Guo, 49, and Tah Wei Chao, 52, were arrested April 7 and held without bail, pending an arraignment later in the month, according to The Associated Press. The men each face up to 20 years in federal prison if convicted. The thermal imaging cameras, which produce heat-based images invisible to the naked eye,

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