later described by the judges as "at worst evasive and at best confusing." There was no third week and, because of equipment problems in the courtroom, only a truncated fourth week. In week 5, Professor Peel of the Defence Evaluation and Research Agency (DERA) gave evidence concerning the baggage container AVE 4041PA. Week 6 was devoted to the testimony behind screens of CIA agents and Bureau of Alcohol, Tobacco and Firearms officers relating to interception of arms caches (including MST-13 timers) in the West African countries of Senegal and Togo. In week 7 Alan Feraday, also of DERA, gave evidence. Feraday presented the court with a simulated IED of the type alleged to have caused the sabotage of PA 103. Under cross-examination, he admitted the fragments of radio cassette and timer, found in DC Gilchrist's cloth/debris (charred) material, had not been tested for explosives residue. The defence were, however, later criticized for having failed to challenge Feraday to explain why his note to Detective Chief Inspector William Williamson in September 1989, covering a Polaroid photograph of the timer fragment (identified in May 1989), said it was "the best I can do in such a short time." Later in week 7, the co-founder of Mebo AG, Erwin Meister, testified that Mebo had supplied Libya with 20 MST-13 timing devices, and identified one of the two accused (Megrahi) as a former business contact. The defence asked Meister, under cross-examination, to explain the purpose of his visit to Syria in 1984. Meister's partner, Edwin Bollier, was questioned in week 8. Bollier said Mebo made a range of products including briefcases equipped to radio-detonate IEDs. He agreed that Mebo had sold 20 MST-13 timers to Libya in 1985 which were later tested by Libyan special forces at their base at Sabha. Bollier said: "I was present when two such timers were included in bomb cylinders". In court, Bollier was shown a number of printed circuit board fragments which he identified as coming from the Mebo MST-13 timer, but he claimed that these timer fragments appeared to have been modified. Joachim Wenzel, an employee of the Stasi, the former East German intelligence agency, testified behind screens in week 9. Wenzel claimed to have been Bollier's handler in the years 1982–85 and testified that Mebo had supplied the Stasi with timers. Former Mebo employee, Ulrich Lumpert, confirmed that as an electronics engineer he had produced all