Study shows that 4% of death row inmates are innocent. 

A new study published in the Proceedings of the National Academy of Sciences uses statistical techniques to estimate that one in every 25 death row inmates in America would be exonerated, given enough time and attention.

The study builds on the data accumulated in the course of years of previous exonerations (examples of which are here) in order to make estimates about the death row population as a whole.

Read it at Gawker.