Loading
Expert Witness Guides
5 min read
Published Date:
Last Modified Date:
Legal cases may take the form of civil, criminal, administrative, family-law, probate, immigration, juvenile, or appellate proceedings, each with different procedures, burdens, remedies, and forum-specific rules. This article explains the major case types, how jurisdiction and standards of proof or review can differ, and when expert witnesses may be used to address specialized evidence.
A legal case is a dispute, prosecution, petition, or other proceeding presented to a court or another body authorized to decide the matter. Common types include civil, criminal, administrative, family-law, probate, immigration, juvenile, and appellate matters. Constitutional issues may arise within several of these proceedings.
An appeal, for example, ordinarily reviews a decision made in an earlier proceeding rather than retrying the case.
This guide explains the major types of legal cases, how their procedures differ, and where expert witnesses may help evaluate or explain specialized evidence.
Legal procedures vary by the type of proceeding, jurisdiction, forum, and issues involved.
A legal case is a dispute, prosecution, petition, or other proceeding presented to a court or another body authorized to decide the matter. Common types include civil, criminal, administrative, family-law, probate, immigration, juvenile, and appellate matters. Constitutional issues may arise within several of these proceedings.
An appeal, for example, ordinarily reviews a decision made in an earlier proceeding rather than retrying the case.
This guide explains the major types of legal cases, how their procedures differ, and where expert witnesses may help evaluate or explain specialized evidence.
Legal procedures vary by the type of proceeding, jurisdiction, forum, and issues involved.
Key differences between civil and criminal cases include the nature of the proceeding and the remedies or penalties involved.
A civil case generally involves a party seeking money damages, an injunction, declaratory relief, or another civil remedy. In federal civil litigation, the plaintiff generally must prove the claim by a preponderance of the evidence. Other civil proceedings or particular claims may apply a different standard under governing law.
A criminal case is brought by the government based on an alleged violation of criminal law. At a criminal trial, the government must prove the defendant's guilt beyond a reasonable doubt. Criminal defendants also have constitutional protections that differ from those applicable in ordinary civil litigation.
The same underlying conduct can give rise to both civil and criminal proceedings, although whether successive proceedings are permissible depends on the applicable law and constitutional limits.
The type of dispute does not by itself determine the proper court or tribunal. Subject-matter jurisdiction determines whether a court has authority over the type of case. Personal jurisdiction, where applicable, venue, and other forum requirements may also affect where the matter can proceed.
Federal courts have limited jurisdiction established by the U.S. Constitution and Congress, while state courts generally handle a broader range of matters. Federal agencies may also have authority over particular administrative or regulatory disputes based on their statutory jurisdiction.
Procedural rules, discovery obligations, evidentiary requirements, deadlines, and expert-witness requirements can vary by forum.
Standards of proof and appellate standards of review address different questions. The applicable burden of proof depends on the proceeding, while appellate courts review earlier rulings under the standard of review applicable to the issue.
Legal cases may end without a full trial in different ways depending on the proceeding.
Civil matters may conclude through settlement, dismissal, summary judgment, or another pretrial ruling. Criminal matters may end through a guilty plea rather than a trial. Certain federal administrative adjudications may also be resolved through settlement, agency decisions, or other procedures authorized by governing law.
Expert analysis may therefore be used before trial, including during discovery and motion practice.
The rules governing expert testimony vary by forum and type of case.
In federal proceedings where the Federal Rules of Evidence apply, Rule 702 governs expert testimony. A qualified expert may testify when the proponent demonstrates to the court, more likely than not, that the expert's specialized knowledge will help the trier of fact understand the evidence or determine a fact in issue, the testimony rests on sufficient facts or data and reliable principles and methods, and the opinion reflects a reliable application of those principles and methods to the case facts.
When a party may use a witness at trial to present expert testimony in a civil case governed by the Federal Rules of Civil Procedure, Rule 26(a)(2) imposes expert disclosure requirements. Unless otherwise stipulated or ordered by the court, Rule 26(a)(2)(B) requires written reports from retained or specially employed testifying experts and from party employees whose duties regularly involve giving expert testimony. Other testifying experts who are not required to provide a written report are subject to Rule 26(a)(2)(C).
State courts and specialized proceedings may use different evidentiary and disclosure rules. Counsel should therefore evaluate qualifications, methodology, factual foundation, opinions, and disclosures under the rules of the particular forum.
What is a legal case?
A legal case is a dispute, prosecution, petition, or other matter presented to a court or authorized tribunal for resolution under applicable law and procedure.
What are the main types of legal cases?
Common categories include civil, criminal, administrative or regulatory, family, probate and estate, immigration, juvenile, and appellate matters. Constitutional issues may arise within several of these categories rather than following one separate procedural track.
What is the main difference between civil and criminal cases?
Civil cases generally seek remedies such as damages or court orders, while criminal cases involve government prosecution for alleged crimes and may result in criminal penalties following conviction.
Do all legal cases go through discovery and trial?
No. Procedures depend on the type of case and forum. Some matters settle, end through motions or pleas, proceed through administrative hearings, or reach appellate review without a new trial.
Can expert witnesses participate in different types of legal cases?
Yes. Expert witnesses may be used in many types of proceedings when specialized knowledge is relevant and the applicable rules permit the testimony. The rules governing their testimony, reports, disclosures, and admissibility depend on the jurisdiction, forum, and specific proceeding.
Key differences between civil and criminal cases include the nature of the proceeding and the remedies or penalties involved.
A civil case generally involves a party seeking money damages, an injunction, declaratory relief, or another civil remedy. In federal civil litigation, the plaintiff generally must prove the claim by a preponderance of the evidence. Other civil proceedings or particular claims may apply a different standard under governing law.
A criminal case is brought by the government based on an alleged violation of criminal law. At a criminal trial, the government must prove the defendant's guilt beyond a reasonable doubt. Criminal defendants also have constitutional protections that differ from those applicable in ordinary civil litigation.
The same underlying conduct can give rise to both civil and criminal proceedings, although whether successive proceedings are permissible depends on the applicable law and constitutional limits.
The type of dispute does not by itself determine the proper court or tribunal. Subject-matter jurisdiction determines whether a court has authority over the type of case. Personal jurisdiction, where applicable, venue, and other forum requirements may also affect where the matter can proceed.
Federal courts have limited jurisdiction established by the U.S. Constitution and Congress, while state courts generally handle a broader range of matters. Federal agencies may also have authority over particular administrative or regulatory disputes based on their statutory jurisdiction.
Procedural rules, discovery obligations, evidentiary requirements, deadlines, and expert-witness requirements can vary by forum.
Standards of proof and appellate standards of review address different questions. The applicable burden of proof depends on the proceeding, while appellate courts review earlier rulings under the standard of review applicable to the issue.
Legal cases may end without a full trial in different ways depending on the proceeding.
Civil matters may conclude through settlement, dismissal, summary judgment, or another pretrial ruling. Criminal matters may end through a guilty plea rather than a trial. Certain federal administrative adjudications may also be resolved through settlement, agency decisions, or other procedures authorized by governing law.
Expert analysis may therefore be used before trial, including during discovery and motion practice.
The rules governing expert testimony vary by forum and type of case.
In federal proceedings where the Federal Rules of Evidence apply, Rule 702 governs expert testimony. A qualified expert may testify when the proponent demonstrates to the court, more likely than not, that the expert's specialized knowledge will help the trier of fact understand the evidence or determine a fact in issue, the testimony rests on sufficient facts or data and reliable principles and methods, and the opinion reflects a reliable application of those principles and methods to the case facts.
When a party may use a witness at trial to present expert testimony in a civil case governed by the Federal Rules of Civil Procedure, Rule 26(a)(2) imposes expert disclosure requirements. Unless otherwise stipulated or ordered by the court, Rule 26(a)(2)(B) requires written reports from retained or specially employed testifying experts and from party employees whose duties regularly involve giving expert testimony. Other testifying experts who are not required to provide a written report are subject to Rule 26(a)(2)(C).
State courts and specialized proceedings may use different evidentiary and disclosure rules. Counsel should therefore evaluate qualifications, methodology, factual foundation, opinions, and disclosures under the rules of the particular forum.
What is a legal case?
A legal case is a dispute, prosecution, petition, or other matter presented to a court or authorized tribunal for resolution under applicable law and procedure.
What are the main types of legal cases?
Common categories include civil, criminal, administrative or regulatory, family, probate and estate, immigration, juvenile, and appellate matters. Constitutional issues may arise within several of these categories rather than following one separate procedural track.
What is the main difference between civil and criminal cases?
Civil cases generally seek remedies such as damages or court orders, while criminal cases involve government prosecution for alleged crimes and may result in criminal penalties following conviction.
Do all legal cases go through discovery and trial?
No. Procedures depend on the type of case and forum. Some matters settle, end through motions or pleas, proceed through administrative hearings, or reach appellate review without a new trial.
Can expert witnesses participate in different types of legal cases?
Yes. Expert witnesses may be used in many types of proceedings when specialized knowledge is relevant and the applicable rules permit the testimony. The rules governing their testimony, reports, disclosures, and admissibility depend on the jurisdiction, forum, and specific proceeding.
Expert Witness Guides
Expert Witness Guides