Which begins:
- The Justice Department, stung by reports that F.B.I. scientists have often vastly overstated their level of certainty in matching hair samples and other evidence, issued new rules on Friday meant to ensure that the experts’ testimony in criminal cases is “supported by sound science.”
The new rules, which have yet to be made final, are the latest in a series of steps that the Obama administration has taken to address the problems, including those revealed in a preliminary review last year of F.B.I. testimony in hair-sample cases.