Double jeopardy is a procedural defence that prevents an accused person from being tried again on the same charges following an acquittal in the same jurisdiction. A variation in civil law countries is the peremptory plea, which may take the specific forms of autrefois acquit or autrefois convict. These doctrines appear to have originated in ancient Roman law, in the broader principle non bis in idem.
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.
Entrapment is a practice in which a law enforcement agent or agent of the state induces a person to commit a "crime" 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."
Abrams v. United States, 250 U.S. 616 (1919), was a decision by the Supreme Court of the United States upholding the 1918 Amendment to the Espionage Act of 1917, which made it a criminal offense to urge the curtailment of production of the materials necessary to wage the war against Germany with intent to hinder the progress of the war. The 1918 Amendment is commonly referred to as if it were a separate Act, the Sedition Act of 1918.
False arrest is a common law tort, where a plaintiff alleges they were held in custody without probable cause, or without an order issued by a court of competent jurisdiction. Although it is possible to sue law enforcement officials for false arrest, the usual defendants in such cases are private security firms.
Olmstead v. United States, 277 U.S. 438 (1928), was a decision of the Supreme Court of the United States, in which the Court reviewed whether the use of wiretapped private telephone conversations, obtained by federal agents without judicial approval and subsequently used as evidence, constituted a violation of the defendant’s rights provided by the Fourth and Fifth Amendments. In a 5–4 decision, the Court held that neither the Fourth Amendment nor the Fifth Amendment rights of the defendant were violated. This decision was later overturned by Katz v. United States in 1967.
Actual innocence is a special standard of review in legal cases to prove that a charged defendant did not commit the crime(s) that he or she is accused of, which is often applied by appellate courts to prevent a miscarriage of justice. The actual innocence standard may be invoked at any time and not only in criminal proceedings but also in immigration and other civil proceedings.
Jacobson v. United States, 503 U.S. 540 (1992), is a case decided by the United States Supreme Court regarding the criminal procedure topic of entrapment. A narrowly divided court overturned the conviction of a Nebraska man for receiving child pornography through the mail, ruling that postal inspectors had implanted a desire to do so through repeated written entreaties.
Sorrells v. United States, 287 U.S. 435 (1932), is a Supreme Court case in which the justices unanimously recognized the entrapment defense. However, while the majority opinion by Chief Justice Charles Evans Hughes located the key to entrapment in the defendant's predisposition or lack thereof to commit the crime, Owen Josephus Roberts' concurring opinion proposed instead that it be rooted in an analysis of the conduct of the law enforcement agents making the arrest. Although the Court has stuck with predisposition, the dispute has hung over entrapment jurisprudence ever since.
Sherman v. United States, 356 U.S. 369 (1958), was a United States Supreme Court case on the issue of entrapment. Unanimously, the Court overturned the conviction of a recovering New York drug addict who had been repeatedly solicited for drug sales by a fellow former addict who was working with federal agents.
Hampton v. United States, 425 U.S. 484 (1976), is a United States Supreme Court decision on the subject of Entrapment. By a 5–3 margin, the Court upheld the conviction of a Missouri man for selling heroin even though all the drug sold was supplied to him, he claimed, by a Drug Enforcement Administration informant who had, in turn, gotten it from the DEA. The majority held that the record showed Hampton was predisposed to sell drugs no matter his source.
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.
Almendarez-Torres v. United States, 523 U.S. 224 (1998), was a decision by the United States Supreme Court which confirmed that a sentencing enhancement based on a prior conviction was not subject to the Sixth Amendment requirement for a jury to determine the fact beyond a reasonable doubt.
Heath v. Alabama, 474 U.S. 82 (1985), is a case in which the United States Supreme Court ruled that, because of the doctrine of "dual sovereignty", the double jeopardy clause of the Fifth Amendment to the Constitution does not prohibit one state from prosecuting and punishing somebody for an act of which they had already been convicted of and sentenced for in another state.
The Double Jeopardy Clause of the Fifth Amendment to the United States Constitution provides: "[N]or shall any person be subject for the same offence to be twice put in jeopardy of life or limb..." The four essential protections included are prohibitions against, for the same offense:
Outrageous government conduct is a criminal defense that presupposes the defendant's predisposition to commit the crime but seeks dismissal of the indictment on the ground that the conduct of law enforcement agents was "so outrageous that due process principles would absolutely bar the government from invoking judicial process to obtain a conviction."
In the law of the United States, the mere evidence rule was a historical doctrine that defined the scope of the Fourth Amendment to the United States Constitution.
United States v. Warshak, 631 F.3d 266 is a criminal case decided by the United States Court of Appeals for the Sixth Circuit holding that government agents violated the defendant's Fourth Amendment rights by compelling his Internet service provider (ISP) to turn over his emails without first obtaining a search warrant based on probable cause. However, constitutional violation notwithstanding, the evidence obtained with these emails was admissible at trial because the government agents relied in good faith on the Stored Communications Act (SCA). The court further declared that the SCA is unconstitutional to the extent that it allows the government to obtain emails without a warrant.
The United States Constitution contains several provisions regarding the law of criminal procedure.
Between 2011 and 2014, the United States Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), part of the Department of Justice under the Obama administration, engaged in a campaign of fabricated sting operations in which individuals were enticed to participate in gun and drug related crimes against entirely fictitious stash house targets for which they were then arrested and convicted. The "made up" crimes were in fact entirely the creation of ATF, and as described by two federal judges, carried severe sentences but were likely to cause grave unfairness and miscarriage of justice.
