Viii opinion and expert testimony p683 a lay

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Statement made before motive to lie. VIII. OPINION AND EXPERT TESTIMONY  (p.683) A. LAY WITNESSES - Generally lay W only testify to facts.  But sometimes opinion difficult  to remove from facts.  Opposing party can always attack assumptions on cross-x. 1. Rule 701 - W can testify in the form of opinion or inference only if they are: a. rationally based on the perception of the witness, and b. helpful to a clear understanding of the W's testimony or the determination of a fact in issue. 34
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2. Rule 602 - Must have evidence that W has personal knowledge of matter. 3. Rule 704(a) - Testimony in the form of an opinion or inference otherwise admissible is  not objectionable b/c it embraces an ultimate issue to be decided by trier of fact.    4. W relate their opinions or conclusions of what they observed, e.g. mental/physical  condition of a person, his character or reputation, emotions, speed of moving object,  size, heights, odors, flavors, color, heat, etc.   (p.685) B. EXPERT WITNESSES 1. Rule 702 - If scientific, technical, or other specialized knowledge will assist trier of fact  to understand the evidence or determine a fact in issue, a W qualified as an expert by  knowledge, skill, experience, training, or education may testify in the form of an opinion or otherwise. a. Who is an expert?  Expert just needs special knowledge.  Don't need formal training. b. When can expert testify?  If what expert says will "assist trier of fact to understand  evidence or determine a fact at issue"  c. Judge has threshold responsibility under this rule to determine if person is expert or  not and what subject he is an expert in. 2. Bases of Expert Testimony  - Rule 703  a. The facts or data that expert bases opinion on may be those perceived by or made  known to the expert at or before the hearing. b. If facts and data are of a type reasonably relied upon by experts in the particular field in forming opinions or inferences upon the subject, they do not need to be admissible in evidence. Problems   c. Some types of evidence that expert can rely on but we do not want to trier of fact to  hear. d. Expert may rely on evidence that is hearsay (e.g. talking to someone else) and  usually inadmissible.  But b/c W is an expert, it can come in as W's opinion.   (Assume expert can sift through and decide what is reliable and what is not) e. Allow this evidence to come in so trier of fact knows what expert relied upon and  can scrutinize expert's reasoning, not for truth of matter.
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