Washington-AP -- An investigation into alleged wrongdoing by an FBI forensic technician has been widened to look into possible shortcomings within the lab itself.
The inquiry is expected to last several more months. It's already led to changes in the DNA unit.
Government officials say an FBI technician went undetected for two years as she failed to follow required procedure in analyzing DNA evidence.
The lab analyzes DNA in hundreds of crime cases a year. DNA evidence has become increasingly important in criminal cases and in appeals from old convictions before DNA evidence was widely used.