This news story comes from The Daily Mail Online, a British publication:

Mr Wright was later told by Stockton police that the order to send in the SWAT team came from The U.S. Department of Education who were looking for his estranged wife to collect defaulted loan payments.

He says he was then detained for six hours while officers looked for his wife – who no longer lives at the house.

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It appears that every department of the federal government will eventually be militarized. This situation is the exact reason the second amendment was added to the Constitution.