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I note from the Berkley Law School website that Yoo has been a professor there since the 1990ies, before he became infamous at the DOJ Office of Legal Counsel, so it would seem likely he had tenure before that, and so remains secure in his position no matter what.
At least as worrying is that his course load includes Constitutional Law and - wait for it -Separation of Powers Law. Like giving an arsonist a blowtorch.