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From the article:

New Jersey election officials have scrapped plans for an independent audit of Union County voting machines because the vendor, Sequoia Voting Systems, says that unauthorized third-party security reviews would violate the county’s license agreement. Sequoia threatened the county with legal action when it learned that election officials were planning to send the machines to a respected Princeton University computer scientist for analysis.

Can someone please explain to me why the US doesn’t require repeated, independent third-party security audits of all voting machines currently in use?