57 Part 2 • The investigator should then explain that the witness should not assume that the investigator knows anything about the case, and that the witness should recount everything they remember, in their own words and in their own time, including as much detail as possible, without thinking about whether issues are relevant or not; The witness should first of all be asked to provide a brief account to “set the scene”. • If appropriate, they can be asked to draw a simple picture or plan. They should be given time to think and to remember everything without being interrupted. Appropriate body language should be used to demonstrate interest, attention and support; • Since the witness may not relate everything in chronological order, notes should be taken, to refer to later in order to clarify matters, rather than constantly interrupting. In serious cases, it may be advisable to taperecord or even video the interview, as this provides a complete record of what was said and can sometimes be used in court (depending on the rules in force in the jurisdiction); • When the witness has finished, the investigator should review the account, trying to put the information in logical order. The witness should be encouraged to correct any mistakes and misunderstandings; • Depending on the legal requirements in force, a detailed written account can then be obtained; and • Supplementary interviews are normally undesirable and should be done only when necessary to clarify significant contradictions that may have arisen as a result of evidence obtained from other sources. Where a witness is especially vulnerable or where the evidence given is especially traumatic, it may be necessary to carry out several interviews.