The new genetic analysis also undercuts the theory that the dingo, a dog that appeared in Australia 4,000 years ago, arrived with a new wave of settlers.
But, Mr. Hardin said, the existence of these documents goes far toward undercutting the theory of federal prosecutors that there was an effort to obstruct justice by destroying documents related to Enron.
Any reliance on history in Fisher therefore undercuts the theory that the 14th Amendment was meant to enforce complete color-blindness, and supports the argument that programs designed to alleviate past racial discrimination are constitutional.
If true, this would mean he did not disclose secret information he learned as Cheney's chief of staff — which would undercut the common theory that the leak came from Cheney's office and that Cheney was trying to take retribution against Wilson by blowing his wife's cover.
The lawyer for Scott Peterson, who is charged with murdering his pregnant wife, opened his defense on Monday, with testimony that he hoped would undercut the prosecution theory that Mr. Peterson used cement to make anchors that pulled his wife's body to the bottom of San Francisco Bay after he killed her.
But last week, Mr. Gowdy, now chairman of the Oversight and Government Reform Committee, went on television and undercut the Spygate conspiracy theory that Mr. Trump has been peddling so vigorously.
The Leipzig group's interbreeding theory would undercut the present belief that all human populations today draw from the same gene pool that existed a mere 50,000 years ago.
The retracted article, citing law enforcement sources, said Mr. Rich had shared thousands of D.N.C. emails with WikiLeaks — a theory that would undercut the assertions that Russia had interfered in the election on behalf of Mr. Trump.
Pulling back on American involvement in these countries would undercut the ability to build cultural bridges that in theory diminish the sort of hostility now vividly on display.
