When a brain injury leads to a personality change and then prison time, a neuroscientist wonders if his brother could have been saved.

Food. Phone calls. Medical care. Transport. Even in public prisons, “piecemeal privatization” is transforming incarceration in America.

The many problems with a common forensic technique called “pattern-matching” — comparisons of bite marks, tool marks, hairs, shoe prints, tire tracks, or fingerprints.