Opinions and Expert Testimony Flashcards
If the witness is not testifying as an expert, any testimony he or she gives that is an opinion or an inference must be:
rationally based on perception
-Witness must have first-hand knowledge
The proper scope of non-expert opinion includes:
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VEMPSS
(1) Value of one’s land
(2) Emotion
(3) Measurements
(4) Physical States (intoxicated, short, fat tall, healthy)
(5) Sensory Descriptions
(6) Sanity of the testatory (in a will)
Improper scope of non-expert opinion
Opinions stated in conclusory terms are NOT appropriate.
EXAMPLE: The plaintiff was contributorily negligent.
EXAMPLE: A contract existed.
EXAMPLE: Defendant assaulted victim.
legal conclusions must be avoided
The requirements for testimony are that experts are
(1) Qualified: an expert must have special knowledge, skill, experience, education, or training
(2) Relevant: Subject matter must be appropriate, and the opinion must be helpful/relevant to assist the jury.
(3) Reliability (Daubert Factors)
An expert opinion must be based upon
reliable methods, devices, or techniques to determine reliability of scientific tests:
(1) other expert testimony (foundation)—battered wife syndrome;
(2) by stipulation—polygraph;
(3) by judicial notice—radar, ballistics, Breathalyzer.
The reliability of scientific tests is determined
by the trial court
Daubert factors for expert evidence includes
TAPES
(1) has the theory been TESTED?
(2) Accepted in the relevant community?
(3) Peer-review of the theory
(4) degree of possible ERROR
(5) Standards
What factors are used to examine an expert’s theory?
- Majority = Daubert Factros
2. Minority = Fry (general acceptance in the community)
There are three bases for opinion testimony of experts
- personal knowledge at or before trial of expert
- hypothetical question give to expert at trial
- Facts given to the expert outside of court
Out of court facts that are given to an expert in preparation for testimony must
be of the type “reasonably relied upon” by other experts in the particular field.
What is the effect when out of court facts that the expert relies upon consist of evidence inadmissible at trial?
CANNOT be revealed UNLESS the proponent shows the probative value of the evidence substantially outweighs its prejudicial effect.
Does a expert have to testify to the underlying facts or data used?
No, unless the court requires or required to disclose them on cross.
Which type of witness can give an opinion on an ultimate issue?
Expert
An expert can pass an opinion on the ultimate issue if?
Permissible
(1) cause of accident, illness, death;
(2) whether a product is unreasonably dangerous/defective;
(3) whether a document is forged/genuine;
(4) whether defendant was insane/mentally ill;
(5) standard of care in a civil malpractice action or a crime
An expert CANNOT pass an opinion on the ultimate issue if?
(1) legal conclusion that plaintiff was contributorily negligent;
(2) legal conclusions regarding the content of law (i.e., defendant intended to kill the victim).