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In criminal law, entrapment is a practice whereby a law enforcement agent induces a person to commit a criminal offense that the person would have otherwise been unlikely to commit. It is a type of conduct that is generally frowned upon, and thus in many jurisdictions is a possible defense against criminal liability.
Depending on the law in the jurisdiction, the prosecution may be required to prove beyond a reasonable doubt that the defendant was not entrapped or the defendant may be required to prove that they were entrapped as an affirmative defense.
Etymology and usage
The Supreme Court of Canada developed the doctrine of entrapment in three major decisions: R. v. Amato,  2 S.C.R. 418, R. v. Mack,  2 S.C.R. 903, and R. v. Barnes,  1 S.C.R. 449. There are two different forms of entrapment in Canadian law.
The first type of entrapment, "random virtue testing", occurs when the police offer an individual the opportunity to commit a crime without reasonable suspicion that either that individual, or the place where that individual is located, is associated with the criminal activity under investigation. If police do have such a reasonable suspicion, they are still limited to providing only an opportunity to commit the offence.
The second form of entrapment occurs when the police go beyond merely providing an opportunity to commit an offence, and instead actually induce the commission of the offence. Some factors a court may consider when deciding whether police have induced the offence include the type of crime being investigated, whether an average person would have been induced, the persistence and number of attempts made by the police, the type of inducement used (e.g. fraud, deceit, reward), and the existence of expressed or implied threats.
The question of entrapment is only considered after there has been a finding of guilt. If, after finding the accused guilty, the court determines that the accused was entrapped, the court will enter a judicial stay of proceedings. In effect, this is similar to an acquittal.
Some examples of entrapment are as follows:
- A police officer encourages a person to commit a crime so that the officer can have them prosecuted for that crime.
- The greater the degree of entrapment by the police officer, the more likely the court will see it as entrapment. See the case R v Bryne . That is, entrapment is not a substantive defense (R v Sang); i.e. it does not automatically negate the prosecution case.
- Customs Officers who aid and abet fraud in order to prosecute the fraud. A notorious example of this occurred in 2003. The 'Stockade' prosecution ended in failure when the Court of Appeal quashed convictions against seven people accused in connection with the alleged diversion of £105 million in excise duty (VAT). The conduct of such Excise diversion cases resulted in the loss of up to £2 billion in public revenue.
If a person has committed an offense because of entrapment, the Court may stay the proceedings under its inherent jurisdiction to prevent abuses of process (which prevents the case going ahead) or exclude evidence under section 78 of the Police and Criminal Evidence Act 1984. The grant of a stay is normally the most appropriate response.
The main authority on entrapment in the United Kingdom is the decision of the House of Lords in R. v. Loosely; Attorney-General's Reference (n.3 of 2000). A grant of a stay is awarded if the conduct of the state was so seriously improper that the administration of justice was brought into disrepute. In deciding whether to grant a stay, the Court will consider, as a useful guide, whether the police did more than present the defendant with an unexceptional opportunity to commit a crime.
In Loosely, Lords Hoffman and Hutton indicated certain factors that should be considered in deciding whether proceedings against a defendant should be stayed. These include:
- Whether the police acted in good faith;
- Whether the police had good reason to suspect the accused of criminal activities;
- Whether the police suspected that crime was particularly prevalent in the area in which the investigation took place (Williams v. DPP);
- Whether pro-active investigatory techniques were necessary because of the secrecy and difficulty of detection of the criminal activity in question;
- The defendant's circumstances and vulnerability; and
- The nature of the offence.
It has been held that it is generally acceptable for the police to conduct test purchases (DPP v. Marshall) or pose as passengers to catch unlicensed taxi drivers (Nottingham City Council v. Amin).
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The French justice system has a wide interpretation of entrapment. In the case called "affaire de Broglie", M. Simone, a police officer, provided the weapon to a person with criminal record, in order to kill prince Jean de Broglie, a well known businessman and politician. The court found both the officer and the killer guilty, and were sentenced to 10 years in jail each.
In German law, it is normally forbidden (§ 26 StGB) to induce or persuade someone to commit a crime, or to attempt to do so (§ 30 StGB, in German). However, the German Federal Court of Justice has held that entrapment by undercover police agents is not a reason to stay the case per se (e.g. GA 1975, 333, 334). If undercover agents have been used without proper justification, punishment for the committed offense may be reduced (1st Senate's decision in 1 StR 148/84 - 23 May 1984).
In the case of persons who are not initially under suspicion and unlikely to commit a certain crime, a decision from 1999 (18th of November, BGH 1 StR 221/99, in German) stated that entrapment of such persons violates the right to a fair trial (and therefore the punishment for the committed offence may be reduced).
England and Wales
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Entrapment arises when a person is encouraged by someone in some official capacity to commit a crime. If entrapment occurred, then some prosecution evidence may be excluded as being unfair, or the proceedings may be discontinued altogether.
In Scotland the main authority is the case of Brown v. HMA 2002 which stated that entrapment will occur when law enforcement officials cause an offense to be committed which would not have occurred had it not been for their involvement. The remedies available correspond with those in England and are considered to be either a plea in bar of trial or a challenge to the admissibility of evidence obtained through entrapment.
The entrapment defense in the United States has evolved mainly through case law. Two competing tests exist for determining whether entrapment has taken place, known as the "subjective" and "objective" tests. The "subjective" test looks at the defendant's state of mind; entrapment can be claimed if the defendant had no "predisposition" to commit the crime. The "objective" test looks instead at the government's conduct; entrapment occurs when the actions of government officers would usually have caused a normally law-abiding person to commit a crime.
Courts took a dim view of the defense at first. "[It] has never availed to shield crime or give indemnity to the culprit, and it is safe to say that under any code of civilized, not to say Christian, ethics, it never will" a New York Supreme Court said in 1864. Forty years later, another judge in that state would affirm that rejection, arguing "[courts] should not hesitate to punish the crime actually committed by the defendant" when rejecting entrapment claimed in a grand larceny case.
Other states, however, had already begun reversing convictions on entrapment grounds. Federal courts recognized entrapment as a defense starting with Woo Wai v. United States, 223 F.1d 412 (9th Cir. 1915). The U.S. Supreme Court first declined to consider the question of entrapment in Casey v. United States, since the facts in the case were too vague to definitively rule on the question. Four years later, it did and in Sorrells v. United States, unanimously reversed the conviction of a North Carolina factory worker who gave in to an undercover Prohibition officer's repeated entreaties to get him some liquor. It identified the controlling question as "whether the defendant is a person otherwise innocent whom the government is seeking to punish for an alleged offense which is the product of the creative activity of its own officials".
In Sherman v. United States, the Court considered a similar case in which one recovering drug addict working with federal agents from the Federal Bureau of Narcotics (a predecessor agency to today's Drug Enforcement Administration (DEA)) solicited another to sell him drugs on the premise that his own efforts were failing. Again unanimous, its opinion focused more clearly on the defendant's predisposition to commit the offense, and on that basis overturned Sherman's conviction as well, since although he had two prior drug convictions, the most recent dated back five years. Furthermore, he was attempting to rehabilitate himself, he had made no profit on the sales, and no drugs were found in his apartment when it was searched, suggesting the absence of a predisposition to break drug laws. "To determine whether entrapment has been established," it said, "a line must be drawn between the trap for the unwary innocent and the trap for the unwary criminal".
Prosecutors won the next two times entrapment came before the Court, in United States v. Russell and Hampton v. United States, albeit by narrow margins. In the former, the Court upheld the conviction of a Washington man for manufacturing methamphetamine even though an undercover agent had supplied some of the ingredients, and also pondered an "outrageous government conduct" defense, though it did not enable it. Hampton let stand, by a similar margin, the conviction of a Missouri man who had, upon seeing track marks on a DEA informant's arms, expressed interest in selling him heroin. After several sales to the informant and undercover agents, he was arrested. The defendant alleged he had been led to believe by the informant that he was not selling heroin but a counterfeit. The Court found he was adequately predisposed to sell heroin in any event.
This became known as the "subjective" test of entrapment, since it focused on the defendant's state of mind. However, in all cases, concurring opinions had advocated an "objective" test, focusing instead on whether the conduct of the police or other investigators would catch only those "ready and willing to commit crime". Under the objective approach the defendant's personality (i.e., his predisposition to commit the crime) would be immaterial, and the potential for the police conduct to induce a law-abiding person considered in the abstract would be the test. This, supporters argued, avoided the dubious issue of an unexpressed legislative intent on which the Sorrells court had relied and instead grounded the entrapment defense, like the exclusionary rule, in the court's supervisory role over law enforcement. And like the exclusionary rule, they would have had judges, not juries, decide whether a defendant had been entrapped as a matter of law.
Since the subjective test focusing on predisposition had, unlike the exclusionary rule, not been applied to the states, they were free to follow it as they saw fit. The state courts or legislatures of 37 states have chosen the subjective test, while the others use the objective test. Some have allowed both the judge and the jury to rule on whether the defendant was entrapped.
In the Supreme Court's last major ruling on entrapment, Jacobson v. United States, which overturned the conviction of a Nebraska man for receiving child pornography via the mail, the subjective vs. objective debate was completely absent. Both the majority and dissenting opinions focused solely on whether the prosecution had established that the defendant had a predisposition for purchasing such material (which had only recently been outlawed at the time of his arrest). Since no other material was found in his home save what he had purchased from the undercover postal inspectors, Justice Byron White believed the operation had implanted the idea in his mind through mailings decrying politicians for assaulting civil liberties by passing laws such as the one the inspectors hoped he would break. Sandra Day O'Connor disagreed in her dissent, arguing that the record did indeed establish that Jacobson was interested in continuing the purchases. Analysts believed that was the Court's indication it considered the subjective vs. objective debate settled.
University of Arizona law professor Gabriel J. Chin points out that the entire federal entrapment defense rests on statutory construction—an interpretation of the will of Congress in passing the criminal statutes. As this is not a Constitutional prohibition, Congress may change or override this interpretation by passing a law.
Entrapment by estoppel
A subset of the entrapment defense was first recognized by the Supreme Court in Raley v. Ohio. There, four defendants were testifying before a committee of the Ohio State Legislature. The chairman of the committee told them that they could assert their right against self-incrimination. They asserted this right, and refused to answer questions. However, Ohio law provided them immunity from prosecution, so the right against self-incrimination was inapplicable, and they were subsequently prosecuted for their failure to answer questions. The Supreme Court overturned three of the four convictions based on the doctrine of entrapment by estoppel. (The fourth refused to state his address, at which point the committee expressed the view that the right against self-incrimination did not apply to that question.)
As described in United States v. Howell, the defense "applies when, acting with actual or apparent authority, a government official affirmatively assures the defendant that certain conduct is legal and the defendant reasonably believes that official".
The entrapment by estoppel defense exists in both federal and state jurisdictions; however, case law remains inconsistent as to whether the misleading advice of e.g. a state official provides protection against federal criminal charges. Examples exist of an appellate court failing to allow an entrapment by estoppel defense where a municipal official provided misleading instructions regarding a state law. 
- Mr. Big (police procedure), a legal technique used in Canada and Australia similar to entrapment
- Sting operation
- Agent provocateur
- DPP v Armstrong
- Sloane (1990) 49 A Crim R 270. See also agent provocateur
- Online Etymology Dictionary
- People v Braisted (13 Colo. App. 532, 58 Pac. 796)
- THE DEFENSE OF ENTRAPMENT IN THE FEDERAL COURTS LSTER B. ORFIELD
- "Judge heads Probe into Customs alcohol bungle, December 2002.
- Board of Commissioners v. Backus, 29 How. Pr. 33, 42 (1864) cited in Lord, Kenneth (1998). "Entrapment and Due Process: Moving Toward A Dual System of Defenses". Fl St. U. Law Rev. 25: 468.
- People v. Mills, 70 N.E. 786, 791 (N.Y. 1904), cited at Lord, supra.
- See John D. Lombardo, Causation and "Objective" Entrapment: Toward a Culpability-Centered Approach, 43 UCLA L. REV. 209, 219-20 (1995). See, e.g., People v. McCord, 42 N.W. 1106 (Mich. 1889)
- Chin, Gabriel J.; The Story of Jacobson v United States: Catching Criminals or Creating Crime?, Arizona Legal Studies Discussion Paper N. 06-12, February 2006, retrieved August 10, 2006, 39. This draft is described as a chapter in the author's forthcoming Criminal Law Stories.
- Casey v. United States 276 U.S. 413 (1928)
- Sorrells v. United States, 287 U.S. 435, 451.
- Sherman v. United States 356 U.S. 369 (1958)
- Sherman v. United States, 356 U.S. 369, 375.
- United States v. Russell 411 U.S. 423 (1973)
- Hampton v. United States 425 U.S. 484 (1976)
- Sorrells, Id., 287 U.S. at 384 (Frankfurter, J., concurring.
- Chin, p. 6, citing Marcus, Paul, The Entrapment Defense.
- Paton, Scott C. (1994). "'The Government Made Me Do It': A Proposed Approach to Entrapment Under Jacobson v. United States". Cornell L. R. 79 (45): 995, 1002.
- Jacobson v. United States 503 U.S. 540 (1992)
- Chin, p. 33
- Raley v. Ohio 360 U.S. 423 (1959)
- United States v. Howell, 37 F.3d 1197, 1204 (7th Cir. 1994)
- Gerald Dworkin, "Entrapment and the Creation of Crime", in Controversies in Criminal Law: Philosophical Essays on Responsibility and Procedure (Boulder, CO: Westview Press, 1992), pp. 220–231.
- Michael J. Gorr and Sterling Harwood, eds., Controversies in Criminal Law: Philosophical Essays on Responsibility and Procedure (Boulder, CO: Westview Press, 1992), 273pp.