Truth and Credibility of witnesses

100. In Onassis and Calogeropoulos v Vergottis [1968] 2 Lloyd’s Rep 403 Lord Pearce discussed credibility. The first two matters he raised dealt with truthfulness, and he then went on to say (at 431):

Thirdly, though he is a truthful person telling the truth as he sees it, did he register the intentions of the conversation correctly and, if so, has his memory correctly retained them? Also, has his recollection been subsequently altered by unconscious bias or wishful thinking or by overmuch discussion of it with others? Witnesses, especially those who are emotional, who think that they are morally in the right, tend very easily and unconsciously to conjure up a legal right that did not exist. It is a truism, often used in accident cases, that with every day that passes the memory becomes fainter and the imagination becomes more active. For that reason a witness, however honest, rarely persuades a Judge that his present recollection is preferable to that which was taken down in writing immediately after the accident occurred. Therefore, contemporary documents are always of the utmost importance. And lastly, although the honest witness believes he heard or saw this or that, is it so improbable that it is on balance more likely that he was mistaken? On this point it is essential that the balance of probability is put correctly into the scales in weighing the credibility of a witness. And motive is one aspect of probability. All these problems compendiously are entailed when a Judge assesses the credibility of a witness; they are all part of one judicial process. And in the process contemporary documents and admitted or incontrovertible facts and probabilities must play their proper part.

101. In Gestmin SGPS S.A. v Credit Suisse (UK) Limited [2013] EWHC 3560 (Comm) Leggatt J said:

[15]   An obvious difficulty which affects allegations and oral evidence based on recollection of events which occurred several years ago is the unreliability of human memory.

 

[16]   While everyone knows that memory is fallible, I do not believe that the legal system has sufficiently absorbed the lessons of a century of psychological research into the nature of memory and the unreliability of eyewitness testimony. One of the most important lessons of such research is that in everyday life we are not aware of the extent to which our own and other people’s memories are unreliable and believe our memories to be more faithful than they are. Two common (and related) errors are to suppose: (1) that the stronger and more vivid is our feeling or experience of recollection, the more likely the recollection is to be accurate; and (2) that the more confident another person is in their recollection, the more likely their recollection is to be accurate.

 

[17]   Underlying both these errors is a faulty model of memory as a mental record which is fixed at the time of experience of an event and then fades (more or less slowly) over time. In fact, psychological research has demonstrated that memories are fluid and malleable, being constantly rewritten whenever they are retrieved. This is true even of so-called ‘flashbulb’ memories, that is memories of experiencing or learning of a particularly shocking or traumatic event. (The very description ‘flashbulb’ memory is in fact misleading, reflecting as it does the misconception that memory operates like a camera or other device that makes a fixed record of an experience.) External information can intrude into a witness’s memory, as can his or her own thoughts and beliefs, and both can cause dramatic changes in recollection. Events can come to be recalled as memories which did not happen at all or which happened to someone else (referred to in the literature as a failure of source memory).

 

[18]   Memory is especially unreliable when it comes to recalling past beliefs. Our memories of past beliefs are revised to make them more consistent with our present beliefs. Studies have also shown that memory is particularly vulnerable to interference and alteration when a person is presented with new information or suggestions about an event in circumstances where his or her memory of it is already weak due to the passage of time.

 

[19]   The process of civil litigation itself subjects the memories of witnesses to powerful biases. The nature of litigation is such that witnesses often have a stake in a particular version of events. This is obvious where the witness is a party or has a tie of loyalty (such as an employment relationship) to a party to the proceedings. Other, more subtle influences include allegiances created by the process of preparing a witness statement and of coming to court to give evidence for one side in the dispute. A desire to assist, or at least not to prejudice, the party who has called the witness or that party’s lawyers, as well as a natural desire to give a good impression in a public forum, can be significant motivating forces.

 

[20]   Considerable interference with memory is also introduced in civil litigation by the procedure of preparing for trial. A witness is asked to make a statement, often (as in the present case) when a long time has already elapsed since the relevant events. The statement is usually drafted for the witness by a lawyer who is inevitably conscious of the significance for the issues in the case of what the witness does nor does not say. The statement is made after the witness’s memory has been “refreshed” by reading documents. The documents considered often include statements of case and other argumentative material as well as documents which the witness did not see at the time or which came into existence after the events which he or she is being asked to recall. The statement may go through several iterations before it is finalised. Then, usually months later, the witness will be asked to re-read his or her statement and review documents again before giving evidence in court. The effect of this process is to establish in the mind of the witness the matters recorded in his or her own statement and other written material, whether they be true or false, and to cause the witness’s memory of events to be based increasingly on this material and later interpretations of it rather than on the original experience of the events.

 

[21]   It is not uncommon (and the present case was no exception) for witnesses to be asked in cross-examination if they understand the difference between recollection and reconstruction or whether their evidence is a genuine recollection or a reconstruction of events. Such questions are misguided in at least two ways. First, they erroneously presuppose that there is a clear distinction between recollection and reconstruction, when all remembering of distant events involves reconstructive processes. Second, such questions disregard the fact that such processes are largely unconscious and that the strength, vividness and apparent authenticity of memories is not a reliable measure of their truth.

 

[22]   In the light of these considerations, the best approach for a judge to adopt in the trial of a commercial case is, in my view, to place little if any reliance at all on witnesses’ recollections of what was said in meetings and conversations, and to base factual findings on inferences drawn from the documentary evidence and known or probable facts. This does not mean that oral testimony serves no useful purpose – though its utility is often disproportionate to its length. But its value lies largely, as I see it, in the opportunity which cross-examination affords to subject the documentary record to critical scrutiny and to gauge the personality, motivations and working practices of a witness, rather than in testimony of what the witness recalls of particular conversations and events. Above all, it is important to avoid the fallacy of supposing that, because a witness has confidence in his or her recollection and is honest, evidence based on that recollection provides any reliable guide to the truth.

102. In Campbell v Campbell [2015] NSWSC 784 Sackar J said:

[73] In Watson v Foxman (1995) 49 NSWLR 315 and 319, McLelland CJ in Eq made the following remarks:

 

…human memory of what was said in a conversation is fallible for a variety of reasons, and ordinarily the degree of fallibility increases with the passage of time, particularly where disputes or litigation intervene, and the processes of memory are overlaid, often subconsciously, by perceptions or self-interest as well as conscious consideration of what should have been said or could have been said. All too often what is actually remembered is little more than an impression from which plausible details are then, again often subconsciously, constructed. All this is a matter of ordinary human experience.

 

[74] I made the following observations in Craig v Silverbrook [2013] NSWSC 1687 at [140]-[142]:

 

[140]   Whilst a trial judge is entitled to make observations relating to the demeanour of certain witnesses, it is a notoriously crude and inaccurate methodology. Its defects have been exposed on numerous occasions.

 

[141 In that regard, I am of course mindful of the comments of Gleeson CJ, Gummow and Kirby JJ in Fox v Percy [2003] HCA 22; (2003) 214 CLR 118 (at [30]-[31]) when they remarked (citations omitted):

 

[30]   It is true, as McHugh J has pointed out, that for a very long time judges in appellate courts have given as a reason for appellate deference to the decision of a trial judge, the assessment of the appearance of witnesses as they give their testimony that is possible at trial and normally impossible in an appellate court. However, it is equally true that, for almost as long, other judges have cautioned against the dangers of too readily drawing conclusions about truthfulness and reliability solely or mainly from the appearance of witnesses. Thus, in 1924 Atkin LJ observed in Societe d’Avances Commerciales (Societe Anonyme Egyptienne) v Merchants Marine Insurance Co (The “Palitana”):

 

“… I think that an ounce of intrinsic merit or demerit in the evidence, that is to say, the value of the comparison of evidence with known facts, is worth pounds of demeanour.”

 

[31]   Further, in recent years, judges have become more aware of scientific research that has cast doubt on the ability of judges (or anyone else) to tell truth from falsehood accurately on the basis of such appearances. Considerations such as these have encouraged judges, both at trial and on appeal, to limit their reliance on the appearances of witnesses and to reason to their conclusions, as far as possible, on the basis of contemporary materials, objectively established facts and the apparent logic of events. This does not eliminate the established principles about witness credibility…

 

[142] In the recent decision of McGraddie v McGraddie and another [2013] UKSC 58; [2013] 1 WLR 2477, the UK Supreme Court emphasised that, especially in cases where a trial judge is faced with a stark choice between irreconcilable accounts, the credibility of the parties’ testimony, and the trial judge’s assessment of the character of witnesses and the manner in which the witnesses give evidence, is of primary importance. Those observations are particularly relevant to the present case. Similar observations have been made in Australian authorities (Fox v Percy at [23]; Rosenberg v Percival [2001] HCA 18; (2001) 205 CLR 434 at [41] per McHugh J and see generally comments in Ritchie’s Uniform Civil Procedure NSW at SCA s 75A.20).

 

[75] In Camden v McKenzie [2008] 1 Qd R 39 at [34] Keane JA (as he then was) made the observation that “the rational resolution of an issue involving the credibility of witnesses will require reference to, and analysis of, any evidence independent of the parties which is apt to cast light on the probabilities of the situation.” This remark was cited with approval by Leeming JA (with whom Barrett JA and Tobias AJA agreed) in New South Wales v Hunt (2014) 86 NSWLR 226 at [56].

 

[76] Hallen J recently set out the relevant principles in Evans and Braddock [2015] NSWSC 249 at [70]-[77]. After referring to Watson v Foxman, his Honour said:

 

[71] In that case, his Honour was talking of a cause of action founded on s 52 of the Trade Practices Act 1974 (Cth) or s 42 of theFair Trading Act 1987 (NSW): see the discussion by McDougall J in Harbour Port Consulting v NSW Maritime [2011] NSWSC 813, at [10] – [18]. However, as McLelland CJ in Eq also pointed out, the views apply to all types of litigation.

 

[72] I also remember what was said by Emmett J (as his Honour then was) in Warner v Hung, in the matter of Bellpac Pty Ltd (Receivers and Managers Appointed) (In Liquidation) (No 2) [2011] FCA 1123; (2011) 297 ALR 56, at [48]:

 

“When proof of any fact is required, the Court must feel an actual persuasion of the occurrence or existence of that fact before it can be found. Mere mechanical comparison of probabilities, independent of any belief in reality, cannot justify the finding of a fact. Actual persuasion is achieved where the affirmative of an allegation is made out to the reasonable satisfaction of the Court. However, reasonable satisfaction is not a state of mind that is attained or established independently of the nature and consequences of the fact to be proved. The seriousness of an allegation made, the inherent unlikelihood of an occurrence of a given description, and the gravity of the consequences flowing from a particular finding are considerations that must affect whether the fact has been proved to the reasonable satisfaction of the Court. Reasonable satisfaction should not be produced by inexact proofs, indefinite testimony or indirect inferences (see Briginshaw v Briginshaw (1938) 60 CLR 336 at 361-2).”

 

[73] The credibility of a witness and his, or her, veracity may also be tested by reference to the objective facts proved independently of the evidence given, in particular by reference to the documents in the case, by paying particular regard to his, or her, motives, and to the overall probabilities: Armagas Ltd v Mundogas S.A. (The “Ocean Frost”) [1985] 1 Lloyd’s Rep 1, per Robert Goff LJ, at 57. Also see, In the matter of Kit Digital Australia Pty Ltd (in liq) [2014] NSWSC 1547, per Black J, at [7].

 

[74] A court, in cases involving events which occurred long before the litigation, usually prefers to rely upon contemporaneous, or near contemporaneous, documents, which will often provide valuable and, usually, more revealing, information than what may be flawed attempts at recollection of those facts by persons with an interest in the outcome of the litigation: Bathurst Regional Council v Local Government Financial Services Pty Ltd (No 5) [2012] FCA 1200, per Jagot J, at [1247]. Greater weight is usually accorded to such documents, as often they provide a safer repository of reliable fact, particularly when it is clear that they have been prepared by a person with no reason to misstate those facts in the documents and where there is no suggestion that the documents are other than genuine: Hughes v St Barbara Mines Ltd [No 4] [2010] WASC 160, per Kenneth Martin J, at[157].

 

[75]   …

 

[76] The circumstances of this case, make what was written by Tamberlin J in Lake Cumbeline Pty Ltd v Effem Foods Pty Ltd (trading as Uncle Ben’s of Australia) (Federal Court of Australia, Tamberlin J, 29 June 1995, unrep), at 122 – 123 (in a passage cited with approval by the High Court when it upheld his Honour’s decision: Effem Foods Pty Ltd v Lake Cumbeline Pty Ltd [1999] HCA 15; (1999) 161 ALR 599, at [15]) appropriate to remember:

 

“[Given the lapse of time] between the events and conversations raised in evidence and the hearing of the evidence before me, the only safe course is to place primary emphasis on the objective factual surrounding material and the inherent commercial probabilities, together with the documentation tendered in evidence. In circumstances where the events took place so long ago, it must be an exceptional witness whose undocumented testimony can be unreservedly relied on. The witnesses in this case unfortunately did not come within that exceptional class. The discussions referred to in evidence were capable of bearing quite opposed meanings depending on subtle differences of nuance and emphasis, and a proper appreciation of the significance of those matters must necessarily be considerably diminished over such a long period of time.”

 

[77]   Finally, I should mention an article by the former the Chief Judge at Common Law, P McClellan entitled “Who Is Telling the Truth? Psychology, Common Sense and the Law” (2006) 80 ALJ 655, in which he wrote, at 665, quoting a passage from the “Guidelines Relating to Recovered Memories” (2000) of the Australian Psychological Society:

 

“Memory is a constructive and reconstructive process. What is remembered about an event is shaped by how that event was experienced, by conditions prevailing during attempts to remember, and by events occurring between the experience and the attempted remembering. Memories can be altered, deleted and created by events that occur during and after the time of encoding, during the period of storage, and during any attempts at retrieval.”

Ultimately, His Honour formed the view that if the melanoma was present it was not discernible by the exercise of reasonable care on the part of the doctor.