The Rules

"As judges of the facts, you alone determine the truthfulness and accuracy of the testimony of each witness. You must decide whether a witness told the truth and was accurate, or instead, testified falsely or was mistaken. You must also decide what importance to give to the testimony you accept as truthful and accurate. It is the quality of the testimony that is controlling, not the number of witnesses who testify. If you find that any witness has intentionally testified falsely as to any material fact, you may disregard that witness's entire testimony."