Evidence
Part of the common law series
Types of evidence
Testimony  · Documentary evidence
Physical evidence  · Digital evidence
Exculpatory evidence  · Scientific evidence
Demonstrative evidence
Relevance
Burden of proof
Laying a foundation
Subsequent remedial measure
Character evidence  · Habit evidence
Authentication
Judicial notice  · Best evidence rule
Self-authenticating document
Ancient document
Witnesses
Competence  · Privilege
Direct examination  · Cross-examination
Impeachment  · Recorded recollection
Expert witness  · Dead man statute
Hearsay (and its exceptions)
Excited utterance  · Dying declaration
Party admission  · Ancient document
Declaration against interest
Present sense impression  · Res gestae
Learned treatise
Other areas of the common law
Contract law  · Tort law  · Property law
Wills and Trusts  · Criminal law

In law, competence is conerns the mental capacity of a individual to participate in legal proceedings. Defendants that do not possess sufficient "competence" are usually excluded from criminal prosecution. While witnesses found not to posess requisite competence cannot testify. Image File history File links SmallLadyJustice. ... The law of evidence governs the use of testimony (eg. ... This article concerns the common-law legal system, as contrasted with the civil law legal system; for other meanings of the term, within the field of law, see common law (disambiguation). ... In law and in religion, testimony is a solemn attestation as to the truth of a matter. ... Documentary evidence is any evidence introduced at a trial in the form of documents. ... Physical evidence is any evidence introduced in a trial in the form of a physical object, intended to prove a fact in issue based on its demonstrable physical characteristics. ... Digital evidence or electronic evidence is any probative information stored or transmitted in digital form that a party to a court case may use at trial. ... Exculpatory evidence is the evidence favorable to the defendant in a criminal trial, which clears or tends to clear the defendant of guilt. ... The scientific method or process is fundamental to the scientific investigation and acquisition of new knowledge based upon physical evidence. ... Demonstrative evidence is evidence used to help the fact-finder gain context for the facts of the case. ... Relevance, in the common law of evidence, is the tendency of a given item of evidence to prove or disprove one of the legal elements of the case, or to have probative value to make one of the elements of the case likelier or not. ... In the common law, burden of proof is the obligation to prove allegations which are presented in a legal action. ... A subsequent remedial measure is a term used in the law of evidence (law) in the United States to describe an improvement or repair made to a structure following an injury caused by the condition of that structure. ... Character evidence is a term used in the law of evidence in the United States to describe any testimony or document submitted for the purpose of proving that a person acted in a particular way on a particular occasion based on the character or disposition of that person. ... Habit evidence is a term used in the law of evidence in the United States to describe any evidence submitted for the purpose of proving that a person acted in a particular way on a particular occasion based on that persons tendancy to reflexively respond to a particular situation... Authentication, in the law of evidence, is the process by which documentary evidence and other physical evidence is proven to be genuine, and not a forgery. ... Judicial Notice is a rule of evidence that allows a fact to be introduced into evidence if the truth of that fact is so notorious or well known that it is cannot be refuted. ... The best evidence rule is a rule of evidence in the United States that requires that when writings are introduced as evidence in a trial, the original writing must be produced unless the party can account satisfactorily for its absence. ... A self authenticating document, under the law of evidence in the United States is any document that can be admitted into evidence at a trial without any proof being submitted to support the claim that the document is what it appears to be. ... An ancient document, in the law of evidence, refers to both a means of authentication for a piece of documentary evidence, and an exception to the hearsay rule. ... This article is about witnesses in law courts. ... A privilege—etymologically private law or law relating to a specific individual—is an honour, or permissive activity granted by another person or a government. ... Direct examination (also called examination in chief) is the questioning of a witness by the party who called him or her, in a trial in a court of law. ... In law, cross-examination is the interrogation of a witness called by ones opponent. ... Witness impeachment, in the law of evidence, is the process of calling into question the credibility of an individual who is testifying in a trial. ... An expert witness is a witness, who by virtue of education, or profession, or experience, is believed to have special knowledge of his subject beyond that of the average person, sufficient that others may officially (and legally) rely upon his opinion. ... A dead man statute is a statute designed to prevent perjury in a civil case by prohibiting a witness who is an interested party from testifying about communications or transactions with a decedant, unless there is a waiver. ... Hearsay in its most general and oldest meaning is a term used in the law of evidence to describe an out of court statement offered to establish the facts asserted in that statement. ... An excited utterance, in the law of evidence, is a statement made by a person in response to a shocking event. ... A dying declaration is a term used in the law of evidence to signify that testimony that would normally be barred as hearsay may nonetheless be admitted as evidence in certain kinds of cases because it constituted the last words of a dying person. ... A party admission, in the law of evidence, is any statement made by a declarant who is a party to a lawsuit, which is offered as evidence against that party. ... An ancient document, in the law of evidence, refers to both a means of authentication for a piece of documentary evidence, and an exception to the hearsay rule. ... Hearsay in its most general and oldest meaning is a term used in the law of evidence to describe an out of court statement offered to establish the facts asserted in that statement. ... A present sense impression, in the law of evidence, is a statement made by a person that conveys their sense of the state of certain things at the time the statement was made. ... This article is for the legal term Res Gestae. For the article on the record of the accomplishments of the first Roman emperor, Augustus, see the article for Res Gestae Divi Augusti. ... A learned treatise, in the law of evidence, is a text that is sufficiently authoritiative in its field to be admissible as evidence in a court in support of the contentions made therein. ... A contract is any legally-enforceable promise or set of promises made between parties. ... In the common law, a tort is a civil wrong, other than a breach of contract for which the law provides a remedy. ... Property law is the law that governs the various forms of ownership in real property (land as distinct from personal or movable possessions) and in personal property, within the common law legal system. ... In the law, a will or testament is a document by which a person (the testator) regulates the rights of others over his property or family after death. ... The law of trusts and estates is generally considered the body of law which governs the management of personal affairs and the disposition of property of an individual in anticipation and the event of such persons incapacity or death, also known as the law of successions in civil law. ... Criminal law (also known as penal law) is the body of law that punishes criminals for committing offences against the state. ... for other uses please see Crime (disambiguation) A crime is an act that violates a political or moral law. ... Criminal law (also known as penal law) is the body of law that regulates governmental sanctions (such as imprisonment and/or fines) as retaliation for crimes against the social order. ...

In the United States

In United States law, this protection has been ruled by the United States Supreme Court to be guaranteed under the due process clause. If the court determines that a defendant's mental condition makes him unable to understand the proceedings, or that he is unable to help in his defense, he is likely to be found incompetent. The specific test, as determined in Dusky v. United States, is whether the accused "has sufficient present ability to consult with his lawyer with a reasonable degree of rational understanding—and whether he has a rational as well as factual understanding of the proceedings against him." Being determined incompetent is substantially different from undertaking an insanity defense; competence regards the defendant's state of mind at the time of the trial, while insanity regards his state of mind at the time of the crime. The Supreme Court Building, Washington, D.C. The Supreme Court Building, Washington, D.C., (large image) The Supreme Court of the United States, located in Washington, D.C., is the highest court (see supreme court) in the United States; that is, it has ultimate judicial authority within the United States... Due process of law is a legal concept that ensures the government will respect all of a persons legal rights instead of just some or most of those legal rights, when the government deprives a person of life, liberty, or property. ... In a criminal trial, the insanity defenses are possible defenses by excuse, via which defendants may argue that they should not be held criminally liable for breaking the law, as they were mentally ill or mentally incompetent at the time of their allegedly criminal actions. ...