Chapter 9

Lay Witnesses
- Individuals who are privy to an event relevant to the issue at hand.
- Generally limited to real evidence.
- Governed by FRE 701:
- Opinion evidence is limited to facts that are rationally based on a witness's perception.
- This evidence must be helpful for clarification and must not be based on special knowledge.
Expert Witnesses
- Role is to assist the jury in understanding evidence that is overly complicated or sophisticated.
- Typically possess advanced degrees, extensive years of study, research, and appropriate licensing.
- However, this category includes any person with specialized knowledge.
- The judge rules on admissibility and scope, but the jury assigns weight and importance.
- Related guidelines are found in FRE 702 and FRE 704.

Role
- Assist in clarifying complex evidence.
Qualifications and Implications
- Expert witnesses are evaluated on three issues by the courts:
1. Is the area in question one in which expert testimony is recognized?
2. What specific qualifications must an individual possess to qualify as an expert witness?
3. Does the proposed witness meet these qualifications and requirements?
Limitations of Expert Testimony
- Expert testimony may not invade issues reserved for a judge or jury.
- Experts are limited to their designated area of expertise (example: connection to cases such as Michael Baden and Jayson Williams involving the accidental discharge of a shotgun).
Other Notes on Experts
- Expert compensation can vary based on demographics, case characteristics, and reputation.
- Experts often provide competing theories or conclusions (example provided: Wecht/defense and Baden/prosecution in the Binion case).
- Demand for expert testimony has grown due to the 'CSI culture'.

Frye v. U.S. (1923)
- This landmark case introduced the original standard for admissibility of expert testimony based on the scientific methods gaining general acceptance in the pertinent field.
- This standard has become largely unworkable due to rapid advancements in different fields.
FRE (1975)
- The Federal Rules of Evidence aimed to streamline the introduction of expert testimony.
Daubert Standard (1993)
- Shifts focus to the principles and methodology rather than conclusions reached.
- It allows states to determine the appropriate tests for expert testimony.
- Factors considered include:
- Testability of the scientific theory or technique.
- Publication and peer-review status.
- Known or potential rates of error associated with the techniques.
- Existence and maintenance of standards controlling the technique's usage.
- General acceptance within the scientific community.

Impeachment of experts occurs before the jury to ensure:
- Testimony is essential for clarification.
- Witness possesses the necessary credentials and qualifications.
- Scope of testimony is within what the court deems acceptable as scientifically or technologically sound.
Cross-examination is standard, where opposing counsel may challenge the credibility of the expert through methods including:
- Evaluating education levels.
- Analyzing the witness's publication record or reputation within the field.
- Reviewing past testimonies in other cases.
- Investigating potential biases or conflicts of interest.

Direct Examination
- Conducted by the calling party.
- Leading questions are not permitted.
- Should avoid surprises.
Cross Examination
- Conducted by opposing counsel.
- Subject matter limited to issues raised in direct examination.
- Leading questions are both admissible and anticipated.
- Often exploratory (may lead to unforeseen revelations).
- Considered central to the adversarial nature of the American legal system.
- Conducted to ensure witness veracity, display facts in favor of the examiner, or impeach the witness.
Other Examination Types
- Includes redirect, recross, and rehabilitation techniques.

Categories for Objections
- Substance: The solicited answer would be inadmissible (e.g., privileged information, hearsay, incompetence, irrelevance).
- Form: Objections based on structure (e.g., argumentative, misleading, conclusive, narrative, leading).
- Answer: Aimed at the answer being stricken from records due to inadmissibility (e.g., privileged information, hearsay, opinion).
Contemporaneous Objection Rule: Requires objections to be made concurrently with the objectionable testimony.

Competency
- The ability of a witness to recollect and communicate; determine the difference between fact and fiction; and appreciate the truth requirement.
Relevance
- Evidence that makes a fact in question more or less probable than it would be without its introduction.
Materiality
- Evidence of such significance that it influences the outcome of the trial.
Example: Eyewitness testimony regarding a defendant fleeing the scene is relevant and material but may not be competent due to the witness's characteristics.

Definition: Supplementary or supporting evidence that strengthens or confirms existing evidence.
Situations Requiring Corroboration
- Often necessary for the testimony of co-conspirators or accomplices.
- Important in alibi defenses.

Witnesses are categorized into lay and expert types.
Lay witnesses present relevant facts; expert witnesses help jurors to comprehend complex evidence.
All witnesses are subject to impeachment processes.
Witness examination follows a specific structure and procedure, where cross-examination is key to the Confrontation Clause.
Objections exist to exclude certain testimonies or to strike particular pieces of evidence.