FBIHe also discussed the FBI's long-standing claim that it could identify bullets by their metallic composition and how that was eventually debunked.
Secret Service (see Martha)
Lest ye think the Virginia lab came through unscathed I must point out there was a discussion of the Earl Washington case (although not first brought up by the speaker). I don't know all the facts in the Washington case but apparently DNA tests should have excluded him because he had the wrong blood type. Later, when the forensic lab retested, it was certified that two people's DNA were in the sample (neither Washington) but even this was called into doubt when a California lab tested and only found one.