1.7 CREDIBILITY OF WITNESSES
In deciding the facts in this case, you may have to decide which testimony to believe and which testimony not to believe. You may believe everything a witness says, or part of it, or none of it.
In considering the testimony of any witness, you may take into account:
(1) the witness’s opportunity and ability to see or hear or know the things testified to;
(2) the witness’s memory;
(3) the witness’s manner while testifying;
(4) the witness’s interest in the outcome of the case, if any;
(5) the witness’s bias or prejudice, if any;
(6) whether other evidence contradicted the witness’s testimony;
(7) the reasonableness of the witness’s testimony in light of all the evidence; and
(8) any other factors that bear on believability.
The weight of the evidence as to a fact does not necessarily depend on the number of witnesses who testify about it. What is important is how believable the witnesses are, and how much weight you think their testimony deserves.
The Committee recommends that the jurors be given some guidelines for determining credibility at the beginning of the trial so that they will know what to look for when witnesses are testifying.
See also Instruction 3.9 (Credibility of Witnesses) for the corresponding instruction to be given at the end of the case.