The FBI announced its new crime lab director today, and fielded criticism that their choice has no forensic science background. Donald Kerr is a physicist-engineer who has headed the government's Los Alamos National Laboratory, supervising the design of nuclear weapons. Attorney General Janet Reno and FBI Director Louis Freeh say Kerr is a good choice because of his science and management background. Critics say the lab needs a forensic scientist to fix poor procedures in handling evidence that were laid out in a report by the Justice Department inspector general. NPR's Barbara Bradley reports.