Tainting evidence -- the FBI crime laboratory

[On this date in 1995 the FBI crime laboratory was the subject of a highly critical television programme broadcast on the ABC network. It followed disclosures by one of the laboratory’s scientists, Dr Frederic Whitehurst, about the methods adopted by some of his colleagues, including Tom Thurman. The scandal later became the subject of a book, Tainting Evidence, by John Kelly and Phillip Wearne. The relevance of this to the Lockerbie case is outlined in the following excerpt from Gareth Peirce’s article The Framing of al-Megrahi in the London Review of Books:]

The key features needed to prosecute al-Megrahi successfully were the scientific identification of the circuit-board fragment, which would in turn establish its origin, and the identification of the purchaser of the clothes in Malta. The timers, the indictment stated, were made by a firm in Switzerland; their circuit board matched the fragment retrieved from Lockerbie, and they sold the timers exclusively to Libya. Everything, essentially, hinged on those links.

Who found the fragment? And who understood its relevance? Thomas Hayes of the Royal Armament Research and Development Establishment (RARDE) claimed the find (with his colleague Alan Feraday) and Thomas Thurman of the FBI claimed the analytical victory. All were swiftly hailed (or hailed themselves) as heroes. Thurman appeared on television on 15 November 1991, the day after indictments were issued against the two Libyans, boasting that he had identified the piece of circuit board as part of a timing device that might have been sold to Libyan Airlines staff. ‘I made the identification and I knew at that point what it meant. And because, if you will, I am an investigator as well as a forensic examiner, I knew where that would go. At that point we had no conclusive proof of the type of timing mechanism that was used in the bombing of 103. When that identification was made of the timer I knew that we had it.’ This was the claim – the hard evidence – that linked Libyans to the crime. If the claim was false the bereaved Lockerbie families have been deceived for 20 years.

On 13 September 1995 the FBI’s forensic department was the subject of a programme broadcast in the US by ABC. At its centre was a memorandum from the former head of explosive science at the FBI, Dr Frederic Whitehurst. It was a devastating indictment of a former colleague. The colleague was Thomas Thurman and the accusations related to his investigation of a terrorist attack in which a judge was killed by pipe bombs. Two years later, as a result of a review by the US inspector general, Michael Bromwich, into a large number of criminal investigations, Thomas Thurman was barred from FBI labs and from being called as an expert witness. Bromwich had discovered that he had no formal scientific qualifications and that, according to a former colleague, he had been ‘circumventing procedures and protocols, testifying to areas of expertise that he had no qualifications in . . . therefore fabricating evidence’.

Thurman had made the Libyan connection, and its plausibility relied on the accuracy of his statement that the fragment of circuit board proved that it would have been possible for the unaccompanied bag to fly from Malta without the seemingly inevitable mid-air explosion. And thus it was that a witness from Switzerland, Edwin Bollier, the manufacturer of the MEBO circuit board, was called on to provide evidence that such boards had been sold exclusively to Libya.