Lord Boyd spoke about each piece of evidence, as follows: Toshiba radio cassette fragment: Mebo timer fragment: Clothing material: Since this statement was made two of the three points have been discredited. In 2007 the Scottish Criminal Cases Review Commission granted Abdelbaset al-Megrahi's application for a new appeal against conviction, citing six points on which the Commission believed that a miscarriage of justice may have occurred. Five of the six points related to evidence demonstrating that the man who bought the clothes from Tony Gauci could not have been Megrahi. In addition, in a book published in 2016, the Scottish Justice Secretary who granted Megrahi compassionate release revealed that "Clothes in the suitcase that carried the bomb were acquired in Malta, though not by Megrahi." The provenance of the item described as the "Mebo timer fragment" was undermined in 2012. In 1990 the fragment of printed circuit board (PCB) recovered among the Pan Am 103 wreckage was discovered by Scottish investigators to have circuitry coated with almost pure tin, consistent with the use of an amateur process known as "liquid tin". However the PCBs used in the MEBO timers were coated with a tin/lead alloy consistent with the use of the standard industrial manufacturing process. All the timer units supplied to Libya had the standard alloy coating; the fragment found at Lockerbie did not. This fact was known to the investigators and the prosecution however it was concealed from the trial court. The discovery in 2013 that the bomb suitcase was on the bottom layer of luggage in the container, not the second layer, and thus that it reconciles to a suitcase seen at Heathrow airport an hour before the feeder flight from Frankfurt landed (see Iran and the Heathrow Angle below) also provides Megrahi with a solid alibi for the crime itself, as he was in Tripoli at the time the brown Samsonite hardshell appeared in the baggage container at Heathrow. Thus the Lord Avocate's 2001 statement as detailed above has been falsified in every respect other than the identity of the radio-cassette player used to conceal the bomb. Reliance on forensic science One of Britain's foremost criminal lawyers, Michael Mansfield QC, spoke on the BBC Scotland Frontline Scotland television episode "Silence over Lockerbie", broadcast on 14 October 1997, warning against over-reliance upon forensic science to secure convictions. He said he wanted to make just one point: A number