A father and son are accused of exporting machinery from the US — machinery authorities say could be used to build weapons of mass destruction in North Korea.
The son, Gary Tsai, was taken into custody at his home in Glenview, Illinois on wednesday and appeared in court in Chicago Monday.
His wife put down their home as collateral.
The judge allowed him to post half a million dollars in bond and ordered him to home confinement.
The father, Alex Tsai, was arrested in Estonia on the same day as his son.
The younger Tsai is accused of shipping a machine to the father in Taiwan in 2008.
The international emergency economic powers act bans anyone in the United States from doing business with the elder Tsai and that includes his son.
The criminal complaint calls the father a proliferator of weapons of mass destruction.
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