You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is All is exempted from oral testimony except- and explain in detail?
Oral testimony is not required in:-

Dying declaration.
Deposition of medical witness taken in lower court.
Evidence given by a witness in a previous judicial proceedings.
Expert opinion expressed in a treatise (ex. book).
Report of a certain government scientific experts eg. chemical examiner, assistant chemical examiner, chief inspector of explosive, director of finger print bureau.
Statement by persons who cannot be called as witness (the person is either dead, untraceable or has become incapable of giving evidence or cannot be called without unreasonable delay or expense to the court).