Section 135 of the Evidence Act 1995 (NSW) permits exclusion of evidence where a party is procedurally disadvantaged by inability to test the evidence, including where a document that should have been produced on subpoena is tendered at trial without prior disclosure. The concept of 'unfair prejudice' in s 135(a) extends beyond misuse of evidence by the tribunal of fact to encompass procedural unfairness. A trial judge assessing economic loss must give reasons for disregarding a plaintiff's pre-accident earnings as shown in tax returns and wage records; failure to do so is an error warranting appellate intervention.
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