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CHAPEL HILL, N.C. (AP) -- A months-long investigation of academic fraud at The University of North Carolina Chapel Hill finds the problems go back a decade earlier than an earlier probe uncovered.

The investigation by former Gov. Jim Martin unveiled Thursday said the African studies department at the school remained at the heart of the two-year athletic and academic scandal that has seen the departure of football coach Butch Davis and resignation of campus chancellor Holden Thorp.

Martin's probe did not find other university academic departments allowed students to cheat, but found the problems in African studies began in 1997.

An earlier probe found irregularities dating from 2007 in more than 50 courses where instructors did not teach, grades were changed and faculty signatures were faked on grade reports.

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