Some testimony, even though relevant, is not admitted at trial because of what is known as the testimonial privilege rule. The rationale for this rule is that:

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The testimonial privilege rule is based on a public policy determination that certain relationships, such as those between a client and attorney, should be protected by excluding some testimony that relates to that relationship. This is done to encourage open communication between parties in the protected relationship and to prevent the harm that could result if such communication were not protected.

Some Testimony, Even Though Relevant, Is Not Admitted at Trial