Day in the life of an Expert Witness

Our day in the life series provides examples of the kind of work undertaken by our members across a range of different professional backgrounds.

Is it within the remit of an expert to decide which witness of fact they believe or disbelieve?
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Is it within the remit of an expert to decide which witness of fact they believe or disbelieve?

The judge noted that the expert readily accepted that integral to his reasoning was that he did not believe the claimant as to the symptoms he had suffered and, probably, teh claimant's account of the incident. In the judge's view, it is entirely outside the remit of an expert to decide which witnesses of fact he believes or disbelieves.

Allard v Govia Thameslink Railway Ltd [2024] EWHC 2227 (KB) 

The dangers of a considerable burden of expert work
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The dangers of a considerable burden of expert work

The court found that a highly respected and hugely experienced histopathologist expert wtiness, who was overburdened with work, had made errors in his examination of the forensic material and closed his mind to possible or probable accidental causes for the injuries identified. 

London Borough of Hammersmith and Fulham v G [2024] EWHC 2200 (Fam) 

Solicitors Regulation Authority Ltd v Khan & Ors [2024] EWCA Civ 531
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Solicitors Regulation Authority Ltd v Khan & Ors [2024] EWCA Civ 531

This case is about whether the judge erred in finding that Ms Soophia Khan had capacity to defend proceedings for contempt of court. This is an important judgment for any psychiatrist called upon to assess fitness to plead and stand trial in a criminal case or litigation capacity in a civil case; and important also for any psychologist whose evidence may be considered in such a case. It is not just because it compares the tests for fitness to plead and stand trial and litigation capacity; it is a rare illustration of not only how a judge at first instance assesses expert evidence in such a case but also of how the court of appeal analyses the judicial reasoning when such a case is appealed.

Pfizer Inc v Uniqure Biopharma BV [2024] EWHC 2672 (Pat)
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Pfizer Inc v Uniqure Biopharma BV [2024] EWHC 2672 (Pat)

The judge in this patent case found that the claimants’ gene therapy expert had developed, quite possibly guided by lawyers, the understanding that the primary duty of an expert witness is not to say anything that may damage the instructing party’s case if it can be avoided.

How not to use AI in expert evidence
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How not to use AI in expert evidence

In this US case, an expert in fiduciary services used Microsoft’s Copilot to cross-check calculations he used in expert evidence. He was unable to recall the prompts he used, state the sources Copilot relied on, or explain how the tool worked and arrived at its outputs. The judge provided some useful insight into the challenges with using AI in expert evidence. 

 

 

Steven Wilson v Ministry of Justice [2024] EWHC 2389 (KB)
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Steven Wilson v Ministry of Justice [2024] EWHC 2389 (KB)

The defendant’s spinal cord injury expert in this case agreed early on in his cross-examination that he had lost all objectivity and independence in the case, while the defendant’s physiotherapy and accommodation experts were criticised by the judge for adopting more partisan approaches in their later evidence.

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