Double jeopardy is a procedural defence that prevents an accused person from being tried again on the same charges and on the same facts, following a valid acquittal or conviction. As described by the U.S. Supreme Court in its unanimous decision concerning Ball v. United States 163 U.S. 662 (1896), one of its earliest cases dealing with double jeopardy, "the prohibition is not against being twice punished, but against being twice put in jeopardy; and the accused, whether convicted or acquitted, is equally put in jeopardy at the first trial."
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 his or her actions due to an episodic or persistent psychiatric disease at the time of the criminal act. This is contrasted with an excuse of provocation, in which defendant is responsible, but the responsibility is lessened due to a temporary mental state. It 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 themselves or to others.
In the United States, the Miranda warning is a type of notification customarily given by police to criminal suspects in police custody advising them of their right to silence; that is, their right to refuse to answer questions or provide information to law enforcement or other officials. These rights are often referred to as Mirandarights. The purpose of such notification is to preserve the admissibility of their statements made during custodial interrogation in later criminal proceedings.
Perjury is the intentional act of swearing a false oath or falsifying an affirmation to tell the truth, whether spoken or in writing, concerning matters material to an official proceeding. In some jurisdictions, contrary to popular misconception, no crime has occurred when a false statement is made while under oath or subject to penalty. Instead, criminal culpability attaches only at the instant the declarant falsely asserts the truth of statements that are material to the outcome of the proceeding. For example, it is not perjury to lie about one's age except if age is a fact material to influencing the legal result, such as eligibility for old age retirement benefits or whether a person was of an age to have legal capacity.
The Sixth Amendment to the United States Constitution sets forth rights related to criminal prosecutions. It was ratified in 1791 as part of the United States Bill of Rights. The Supreme Court has applied most of the protections of this amendment to the states through the Due Process Clause of the Fourteenth Amendment.
The United States courts of appeals or circuit courts are the intermediate appellate courts of the United States federal court system. A court of appeals decides appeals from the district courts within its federal judicial circuit, and in some instances from other designated federal courts and administrative agencies.
Schenck v. United States, 249 U.S. 47 (1919), was a landmark United States Supreme Court case concerning enforcement of the Espionage Act of 1917 during World War I. A unanimous Supreme Court, in an opinion by Justice Oliver Wendell Holmes Jr., concluded that defendants who distributed fliers to draft-age men, urging resistance to induction, could be convicted of an attempt to obstruct the draft, a criminal offense. The First Amendment did not alter the well-established law in cases where the attempt was made through expressions that would be protected in other circumstances. In this opinion, Holmes said that expressions which in the circumstances were intended to result in a crime, and posed a "clear and present danger" of succeeding, could be punished.
In criminal law, entrapment is a practice whereby a law enforcement agent or agent of the state induces a person to commit a criminal offense that the person would have otherwise been unlikely or unwilling to commit. It "is the conception and planning of an offense by an officer or agent, and the procurement of its commission by one who would not have perpetrated it except for the trickery, persuasion or fraud of the officer or state agent."
Reasonable doubt is a term used in jurisdiction of common law countries. Evidence that is beyond reasonable doubt is the standard of evidence required to validate a criminal conviction in most adversarial legal systems.
Criminal jurisdiction is a term used in constitutional law and public law to describe the power of courts to hear a case brought by a state accusing a defendant of the commission of a crime. It is relevant in three distinct situations:
- to regulate the relationship between states, or between one state and another;
- where the nation is a federation, to regulate the relationship between the federal courts and the domestic courts of those states comprising the federation; and
- where a state only has, to a greater or lesser extent, a single and unified system of law, it is the law of criminal procedure to regulate what cases each classification of court within the judicial system shall adjudicate upon. People must be tried in the same state the crime is committed.
Expectation of privacy is a legal test which is crucial in defining the scope of the applicability of the privacy protections of the Fourth Amendment to the United States Constitution. It is related to, but is not the same as, a right to privacy, a much broader concept which is found in many legal systems.
Massiah v. United States, 377 U.S. 201 (1964), was a case in which the Supreme Court of the United States held that the Sixth Amendment to the United States Constitution prohibits the government from eliciting statements from the defendant about themselves after the point that the Sixth Amendment right to counsel attaches.
The Fifth Amendment to the United States Constitution addresses criminal procedure and other aspects of the Constitution. It was ratified in 1791 as part of the Bill of Rights. The Fifth Amendment applies to every level of the government, including the federal, state, and local levels, as well as any corporation, private enterprise, group, or individual, or any foreign government in regards to a US citizen or resident of the US. The Supreme Court furthered the protections of this amendment through the Due Process Clause of the Fourteenth Amendment.
Spectrum Sports, Inc. v. McQuillan, 506 U.S. 447 (1993), was a case in which the Supreme Court of the United States rejected the assertion that attempted monopolization may be proven merely by demonstration of unfair or predatory conduct. Instead, conduct of a single firm could be held to be unlawful attempted monopolization only when it actually monopolized or dangerously threatened to do so. Thus, the Court rejected the conclusion that injury to competition could be presumed to follow from certain conduct. The causal link must be demonstrated.
Pereira v. United States, 347 U.S. 1 (1954), was a United States Supreme Court case in which the Court held that the word "knowingly" in the federal mail fraud statute, 18 U.S.C. § 1341, should extend to all reasonably foreseeable consequences, even ones not specifically intended.
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."
