Yes, the defense witness's testimony should be allowed to show substantive evidence.
A plaintiff can be defined as the person who bring a case to the court of law while a defendant is the person who was accused for committing and offence by the plaintiff.
Based on the scenario the attorney should allow the defendant bring or show the evidence that will help to prove that plaintiff was in fact a thief.
Therefore the defense witness's testimony should be allowed to show substantive evidence.
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