A professor accused and cleared of intentional plagiarism has been accused again, this time for his new book.

Inside Higher Ed’s Colleen Flaherty files this report.

An investigation into plagiarism allegations against an Arizona State University professor of history in 2011 found him not guilty of deliberate academic misconduct, but the case remained controversial. The chair of his department’s tenure committee resigned in protest and other faculty members spoke out against the findings, saying their colleague – who recently had been promoted to full professor – was cleared even though what he did likely would have gotten an undergraduate in trouble.

Now, Matthew C. Whitaker has written a new book, and allegations of plagiarism are being levied against him once again. Several blogs – one anonymously, and in great detail – have documented alleged examples of plagiarism in the work. Several of his colleagues have seen them, and say they raise serious questions about Whitaker’s academic integrity.

Meanwhile, Whitaker says he won’t comment on allegations brought forth anonymously, and his publisher, the University of Nebraska Press, says it’s standing by him.

Three years ago, several senior faculty members in Whitaker’s department accused him of uncited borrowing of texts and ideas from books, Wikipedia and a newspaper article in his written work and a speech. In response, the university appointed a three-member committee to investigate. The group found that Whitaker’s work contained no “substantial or systematic plagiarism,” but that he had been careless in some instances, as reported by Inside Higher Ed at the time. As a result, the university did not impose serious sanctions on the scholar, who is the founding director of Arizona State’s Center for the Study of Race and Democracy.

In response, Monica Green, professor of history, resigned as department tenure committee chair. Several other professors called the investigation flawed and incomplete in a formal complaint to the university and in public statements.

Whitaker at the time told the university that his colleagues were pursuing a personal vendetta, possibly due to his race and the fact that they disagreed with his promotion, The Arizona Republic reported.