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EXPERT EVIDENCE – THE ROLE, DUTIES AND …

EXPERT EVIDENCE THE ROLE, DUTIES AND RESPONSIBILITIES OF THE EXPERT witness IN LITIGATION1 By Robert Sutherland, Advocate An EXPERT has been defined as a person with the status of an authority (in a subject) by reason of special skill, training or knowledge; a specialist 2. An EXPERT witness has been described as one who has made the subject upon which he speaks a matter of particular study, practice or observation: and he must have a particular and special knowledge of the subject 3. This article looks at the question of what it is that makes an EXPERT an EXPERT witness for the purposes of litigation, and why it is necessary for a witness to be more than knowledgeable in order to be considered an EXPERT witness .

The principle duties and responsibilities of an expert witness have been summarised by Mr. Justice Cresswell in National Justice Compania Naviera SA v Prudential Assurance

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Transcription of EXPERT EVIDENCE – THE ROLE, DUTIES AND …

1 EXPERT EVIDENCE THE ROLE, DUTIES AND RESPONSIBILITIES OF THE EXPERT witness IN LITIGATION1 By Robert Sutherland, Advocate An EXPERT has been defined as a person with the status of an authority (in a subject) by reason of special skill, training or knowledge; a specialist 2. An EXPERT witness has been described as one who has made the subject upon which he speaks a matter of particular study, practice or observation: and he must have a particular and special knowledge of the subject 3. This article looks at the question of what it is that makes an EXPERT an EXPERT witness for the purposes of litigation, and why it is necessary for a witness to be more than knowledgeable in order to be considered an EXPERT witness .

2 Where a client is involved, or is likely to become involved, in litigation there can be two reasons for consulting an EXPERT . One reason is to have a knowledgeable person act as an adviser and advocate for your own side. Such a person might be used to comment on the strengths and weaknesses of the parties respective positions, or to act as a sounding board to test different theories or advise on lines of inquiry. In that situation the person who is looking for a specialist wants someone with particular and special knowledge, but they are looking to that person to help develop or advance a particular argument on their behalf. What is being looked for there is someone to help the client promote their interest over any other interest.

3 However a person who takes on the role of an EXPERT witness has a different function. The job of the EXPERT witness is not simply to articulate their client s position; it is to assist the decision maker (a court, tribunal or other similar body) with the information about the specialist area which is necessary before a decision can be made. This was discussed in Davie v Magistrates of Edinburgh4. In that case an action was brought for damage done to the pursuer s house by blasting operations associated with the construction of a sewer tunnel some three hundred yards from the house. The defenders led a civil engineer, who gave EVIDENCE as to the effect on houses of underground blasting and, in particular, stated that the shock of explosion lessened according to the square of the distance from the point of explosion, and that the blasting complained of would not have caused the damage complained of owing to its distance from the house.

4 They also led the EVIDENCE a mining engineer and adviser on blasting, who had made a special study of the effect of blasting vibrations on structures. His EVIDENCE was of similar effect and also that the amount of explosive used 1 would not have caused the damage complained of. This EVIDENCE was concurred in by a third witness who was cross-examined as to his qualifications and experience, but gave no independent EVIDENCE . The defenders sought to argue that as no counter EVIDENCE on the science of explosives and their effects was led for the pursuer the Court was bound to accept the conclusions of the mining engineer who had given EVIDENCE . The court rejected this, saying that an EXPERT witness , however skilled or eminent, can give no more than EVIDENCE .

5 The EXPERT cannot usurp the functions of the jury or judge sitting as a jury, any more than a technical assessor can substitute his advice for the judgment of the Court. It was held that the duty of the EXPERT witness , .. is to furnish the Judge or jury with the necessary scientific criteria for testing the accuracy of their conclusions, so as to enable the Judge or jury to form their own independent judgment by the application of these criteria to the facts proved in EVIDENCE . The scientific opinion EVIDENCE , if intelligible, convincing and tested, becomes a factor (and often an important factor) for consideration along with the whole other EVIDENCE in the case, but the decision is for the Judge or jury. In particular the bare ipse dixit of a scientist, however eminent, upon the issue in controversy, will normally carry little weight, for it cannot be tested by cross-examination nor independently appraised, and the parties have invoked the decision of a judicial tribunal and not an oracular pronouncement by an EXPERT .

6 5 It is these two limitations on the role of the EXPERT witness which therefore define what the DUTIES and responsibilities of an EXPERT witness are. The primary duty of the EXPERT witness is to the court and not to the client. The specialist skill, knowledge and experience of the EXPERT witness is therefore to be used to assist the court. That gives rise to a number of consequences. If the witness is putting themselves forward as an EXPERT it follows that the opinions that person expresses should be within that individual s area of expertise. They must be satisfied that the information they present is accurate and complete, that they have taken into account all relevant matters and not taken into account irrelevant matters.

7 So far as taking into account all relevant matters is concerned, this also includes matters which might be contrary to the opinion they have formed. The factual information underlying any opinion EVIDENCE must be based on actual knowledge or on identifiable source of information. Where it is possible for there to be a range of reasonable opinion on any matter this should be acknowledged. The opinions the EXPERT expresses should be the EXPERT s own, formed independently, and not the views of either the client or of any other person. Where an EXPERT witness is being asked to express a view about the actions of another professional or specialist then the EXPERT witness must also understand the correct legal test which the court applies to that professional or specialist s acts.

8 2 The principle DUTIES and responsibilities of an EXPERT witness have been summarised by Mr. Justice Cresswell in National Justice Compania Naviera SA v Prudential Assurance Company Limited6, (also known as the Ikarian Reefer case). This summary has received approval in Scotland in the cases of Elf Caledonian Limited v London Bridge Engineering Limited7, and McTear v Imperial Tobacco Ltd8. In the Ikarian Reefer case Mr Justice Cresswell said that he believed that a misunderstanding on the part of certain of the EXPERT witnesses in the case as to their DUTIES and responsibilities contributed to the length of the court proceedings. It was for these reasons that in the course of his judgement he set out the following: THE DUTIES AND RESPONSIBILITIES OF EXPERT WITNESSES The DUTIES and responsibilities of EXPERT witnesses in civil cases include the following: 1.

9 EXPERT EVIDENCE presented to the Court should be, and should be seen to be, the independent product of the EXPERT uninfluenced as to form or content by the exigencies of litigation (Whitehouse v. Jordan, [1981] 1 246 at p. 256, per Lord Wilberforce). 2. An EXPERT witness should provide independent assistance to the Court by way of objective unbiased opinion in relation to matters within his expertise (see Polivitte Ltd. v. Commercial Union Assurance Co. Plc., [1987] 1 Lloyd's Rep. 379 at p. 386 per Mr. Justice Garland and Re J, [1990] 193 per Mr. Justice Cazalet). An EXPERT witness in the High Court should never assume the role of an advocate. 3. An EXPERT witness should state the facts or assumption upon which his opinion is based. He should not omit to consider material facts which could detract from his concluded opinion (Re J sup.)

10 4. An EXPERT witness should make it clear when a particular question or issue falls outside his expertise. 5. If an EXPERT 's opinion is not properly researched because he considers that insufficient data is available, then this must be stated with an indication that the opinion is no more than a provisional one (Re J sup.). In cases where an EXPERT witness who has prepared a report could not assert that the report contained the truth, the whole truth and nothing but the truth without some qualification, that qualification should be stated in the report (Derby & Co. Ltd. and Others v. Weldon and Others, The Times, Nov. 9, 1990 per Lord Justice Staughton). 6. If, after exchange of reports, an EXPERT witness changes his view on a material matter having read the other side's EXPERT 's report or for any other reason, such change of view should be communicated (through legal representatives) to the other side without delay and when appropriate to the Court.


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