Competence (law)
quality of natural and juridical persons necessary for their actions to have legal effect
In United States and Canadian law, competence concerns the mental capacity of an individual to participate in legal proceedings or transactions, and the mental condition a person must have to be responsible for his or her decisions or acts. Competence is an attribute that is decision-specific. Depending on various factors which typically revolve around mental function integrity, an individual may or may not be competent to make a particular medical decision, a particular contractual agreement, to execute an effective deed to real property, or to execute a will having certain terms.
Depending on the state, a guardian or conservator may be appointed by a court for a person who satisfies the state's tests for general incompetence, and the guardian or conservator exercises the incompetent's rights for the incompetent. Defendants who do not possess sufficient "competence" are usually excluded from criminal prosecution, while witnesses found not to possess requisite competence cannot testify. The English equivalent is fitness to plead.
United States
The word incompetent is used to describe persons who should not undergo or partake in certain judicial processes, and also for those who lack mental capacity to make contracts, handle their financial and other personal matters such as consenting to medical treatment, etc. and need a legal guardian to handle their affairs.
Competence to stand trial
In United States law, the right to not be prosecuted while one is incompetent to stand trial 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 found incompetent.
Begin with the source’s own compact description: “Competence (law)” is quality of natural and juridical persons necessary for their actions to have legal effect. The dossier treats that line as a proposition to test through Competence, quality and natural, not as a finished interpretation.
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The phrase “quality of natural and juridical persons necessary for their actions to have legal effect” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Jun 17, 2026. The linked authority identifier is Q584804. The Library of Congress control number is sh85019863. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank.
The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “Competence (law)” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.