The insanity defense, also known as the mental disorder defense, is an affirmative defense by excuse in a criminal case, arguing that the defendant is not responsible for their actions due to a psychiatric disease at the time of the criminal act. This is contrasted with an excuse of provocation, in which the defendant is responsible, but the responsibility is lessened due to a temporary mental state. It is also contrasted with the justification of self defense or with the mitigation of imperfect self-defense. The insanity defense is also contrasted with a finding that a defendant cannot stand trial in a criminal case because a mental disease prevents them from effectively assisting counsel, from a civil finding in trusts and estates where a will is nullified because it was made when a mental disorder prevented a testator from recognizing the natural objects of their bounty, and from involuntary civil commitment to a mental institution, when anyone is found to be gravely disabled or to be a danger to themself or to others.
In common law jurisdictions, a preliminary hearing, preliminary examination, preliminary inquiry, evidentiary hearing or probable cause hearing is a proceeding, after a criminal complaint has been filed by the prosecutor, to determine whether there is enough evidence to require a trial. At such a hearing, the defendant may be assisted by a lawyer.
Forensic psychiatry is a subspeciality of psychiatry and is related to criminology. It encompasses the interface between law and psychiatry. According to the American Academy of Psychiatry and the Law, it is defined as "a subspecialty of psychiatry in which scientific and clinical expertise is applied in legal contexts involving civil, criminal, correctional, regulatory, or legislative matters, and in specialized clinical consultations in areas such as risk assessment or employment." A forensic psychiatrist provides services – such as determination of competency to stand trial – to a court of law to facilitate the adjudicative process and provide treatment, such as medications and psychotherapy, to criminals.
In criminal law, the right to counsel means a defendant has a legal right to have the assistance of counsel and, if the defendant cannot afford a lawyer, requires that the government appoint one or pay the defendant's legal expenses. The right to counsel is generally regarded as a constituent of the right to a fair trial. Historically, however, not all countries have always recognized the right to counsel. The right is often included in national constitutions. Of the 194 constitutions currently in force, 153 have language to this 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.
Faretta v. California, 422 U.S. 806 (1975), was a case in which the Supreme Court of the United States held that criminal defendants have a constitutional right to refuse counsel and represent themselves in state criminal proceedings.
Strickland v. Washington, 466 U.S. 668 (1984), was a landmark Supreme Court case that established the standard for determining when a criminal defendant's Sixth Amendment right to counsel is violated by that counsel's inadequate performance.
In the United States criminal justice system, a competency evaluation is an assessment of the ability of a defendant to understand and rationally participate in a court process.
Jackson v. Indiana, 406 U.S. 715 (1972), was a landmark decision of the United States Supreme Court that determined a U.S. state violated due process by involuntarily committing a criminal defendant for an indefinite period of time solely on the basis of his permanent incompetency to stand trial on the charges filed against him.
Godinez v. Moran, 509 U.S. 389 (1993), was a landmark decision in which the U.S. Supreme Court ruled that if a defendant was competent to stand trial, they were automatically competent to plead guilty, and thereby waive the panoply of trial rights, including the right to counsel.
Addington v. Texas, 441 U.S. 418 (1979), was a landmark decision of the US Supreme Court that set the standard for involuntary commitment for treatment by raising the burden of proof required to commit persons for psychiatric treatment from the usual civil burden of proof of "preponderance of the evidence" to "clear and convincing evidence".
Estelle v. Smith, 451 U.S. 454 (1981), was a United States Supreme Court case in which the Court held that, per Miranda v. Arizona (1966), the state may not force a defendant to submit to a psychiatric examination solely for the purposes of sentencing. Any such examination violates the defendant's Fifth Amendment rights against self-incrimination as well as the Sixth Amendment right to counsel, and is therefore inadmissible at sentencing.
Barefoot v. Estelle, 463 U.S. 880 (1983), is a United States Supreme Court case. The Court ruled on the admissibility of clinical opinions given by two psychiatrists hired by the prosecution in answer to hypothetical questions regarding the defendant's future dangerousness and the likelihood that he would present a continuing threat to society in this Texas death penalty case. The American Psychiatric Association submitted an amicus curiae brief in support of the defendant's position that such testimony should be inadmissible and urging curtailment of psychiatric testimony regarding future dangerousness and a prohibition of such testimony based on hypothetical data.
Drope v. Missouri, 420 U.S. 162 (1975), was a United States Supreme Court case in which the Court held a Missouri trial court deprived a defendant of due process by failing to order a competency examination after he was hospitalized following an attempted suicide and as a result missed a portion of his trial for a capital offense.
Cooper v. Oklahoma, 517 U.S. 348 (1996), was a United States Supreme Court case in which the Court reversed an Oklahoma court decision holding that a defendant is presumed to be competent to stand trial unless he proves otherwise by the second highest legal standard of proof, that of clear and convincing evidence, ruling that to be unconstitutional. The court said the defendant's Fourteenth Amendment rights to due process were violated.
Ake is an archaeological site of the pre-Columbian Maya civilization, located in the state of Yucatán, Mexico.
Indiana v. Edwards, 554 U.S. 164 (2008), was a United States Supreme Court case in which the Court held that the standard for competency to stand trial was not linked to the standard for competency to represent oneself.
United States federal laws governing offenders with mental diseases or defects provide for the evaluation and handling of defendants who are suspected of having mental diseases or defects. The laws were completely revamped by the Insanity Defense Reform Act in the wake of the John Hinckley Jr. verdict.
The Assistance of Counsel Clause of the Sixth Amendment to the United States Constitution provides: "In all criminal prosecutions, the accused shall enjoy the right...to have the Assistance of Counsel for his defence."
Washington v. Texas, 388 U.S. 14 (1967), is a United States Supreme Court case in which the Court decided that the Compulsory Process Clause of the Sixth Amendment to the Constitution is applicable in state courts as well as federal courts. Jackie Washington had attempted to call his co-defendant as a witness, but was blocked by Texas courts because state law prevented co-defendants from testifying for each other, under the theory that they would be likely to lie for each other on the stand.
