One of most prominent cases of poor police investigating was the acquittal six years ago of Cape Town statistician Fred Van der Vyver, accused of murdering his young student girlfriend in 2005.

BBC: Africa

Another was Akbar Mohammadi, a student activist who has been in and out of prisons for the past six years.

NPR: Iran Cracks Down on Dissenters

The GSR measures the percentage of first-time, full-time freshman who graduate within six years of entering their original four-year institution, with modifications to account for (1) student-athletes who transfer from an institution before graduating who are in good academic standing and (2) student-athletes who transfer into an institution (e.g. from a community college or another 4-year college) and earn a degree.

FORBES: Notre Dame's Football Challenge: Overcoming Disparities in Adherence to High Academic Standards