Not every expert engagement ends in a report. Some of the most valuable forensic work in Australian litigation is advisory: a confidential review of the opposing side's expert evidence, conducted under legal professional privilege, that never gets filed — it gets used.
Where Opposing Reports Are Vulnerable
The benchmark set in Makita (Australia) Pty Ltd V Sprowles (2001) 52 NSWLR 705 is demanding: the expert must expose how their specialised knowledge, applied to identified facts, produces the opinion. Courts apply it with varying strictness — the High Court in Lang V the Queen [2023] HCA 29 confirmed the requirement is not absolute — but a report that satisfies Makita survives anywhere. Digital forensic reports fall short of it more often than you'd expect — conclusions asserted from tool output without validation, timestamps quoted without timezone analysis, "the user did X" where the data only supports "the device did X". A shadow expert reads the report the way the tool reads the phone: artefact by artefact.
What the Engagement Produces
A privileged memo identifying methodological gaps, overreach and untested assumptions; cross-examination lines keyed to the Harmonised Expert Witness Code of Conduct obligations the opposing expert has signed up to; and a clear view on whether to meet the evidence with your own expert or dismantle it in cross. In concurrent evidence sessions — the "hot tub" now routine in Australian courts — that preparation is the difference between an expert who concedes and one who converts the panel.
Because the review is advisory, independence rules don't bar the same firm from later filing a responsive report — but the two roles are kept deliberately distinct from the first instruction.
Frequently Asked Questions
What Is a Shadow Expert?
A forensic expert engaged confidentially, through the legal team, to advise on and test the opposing side's expert evidence rather than to file a report. The work product — a memo on methodological gaps and cross-examination lines — is used in strategy, not tendered.
What Standard Must an Expert Report Meet in Australia?
The benchmark in Makita (Australia) Pty Ltd V Sprowles (2001) 52 NSWLR 705: the expert must expose how their specialised knowledge, applied to identified facts, produces the opinion. The High Court in Lang V the Queen [2023] HCA 29 confirmed the requirement is not absolute — but a report that satisfies Makita survives anywhere.
Can the Same Firm Later File a Responsive Expert Report?
Because the shadow review is advisory, independence rules do not bar the same firm from later filing a responsive report — but the two roles must be kept deliberately distinct from the first instruction, and your lawyers should confirm the position in your matter.