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The term criminal law, sometimes called penal law, refers to any of various bodies of rules in different jurisdictions whose common characteristic is the potential for unique and often severe impositions as punishment for failure to comply. Criminal law typically is enforced by the government, unlike the civil law, which may be enforced by private parties.
Criminal punishment, depending on the offense and jurisdiction, may include execution, loss of liberty, government supervision (parole or probation), or fines. There are some archetypal crimes, like murder, that feature in all such bodies of law, but the acts that are forbidden are not wholly consistent between different criminal codes, and even within a particular code lines may be blurred as civil infractions may give rise also to criminal consequences. Criminal law generally, thus, may be considered the rules that apply when an offense is committed against the public, society in general. In this sense, criminal law is of the utmost importance in maintaining and developing societies of peace and harmony, wherein all members contribute to the common good or must face the consequences.
The first civilizations generally did not distinguish between civil and criminal law. The first known written codes of law were produced by the Sumerians. In the twenty-first century B.C.E., King Ur-Nammu acted as the first legislator and created a formal system in 32 articles: the Code of Ur-Nammu. Another important ancient code was the Code of Hammurabi, which formed the core of Babylonian law. Neither set of laws separated penal codes and civil laws.
The similarly significant Commentaries of Gaius on the Twelve Tables also conflated the civil and criminal aspects, treating theft or furtum as a tort. Assault and violent robbery were analogized to trespass as to property. Breach of such laws created an obligation of law or vinculum juris discharged by payment of monetary compensation or damages.
The first signs of the modern distinction between crimes and civil matters emerged during the Norman Invasion of England. The special notion of criminal penalty, at least concerning Europe, arose in Spanish Late Scholasticism (see Alfonso de Castro, when the theological notion of God's penalty (poena aeterna) that was inflicted solely for a guilty mind, became transfused into canon law first and, finally, to secular criminal law. The development of the state dispensing justice in a court clearly emerged in the eighteenth century when European countries began maintaining police services. From this point, criminal law had formal the mechanisms for enforcement, which allowed for its development as a discernible entity.
Criminal law is distinctive for the uniquely serious potential consequences of failure to abide by its rules. Capital punishment may be imposed in some jurisdictions for the most serious crimes. Physical or corporal punishment may be imposed such as whipping or caning, although these punishments are prohibited in much of the world. Individuals may be incarcerated in prison or jail in a variety of conditions depending on the jurisdiction. Confinement may be solitary. Length of incarceration may vary from a day to life. Government supervision may be imposed, including house arrest, and convicts may be required to conform to particularized guidelines as part of a parole or probation regimen. Fines also may be imposed, seizing money or property from a person convicted of a crime.
Five objectives are widely accepted for enforcement of the criminal law by punishments: retribution, deterrence, incapacitation, rehabilitation and restitution. Jurisdictions differ on the value to be placed on each.
Public international law deals extensively and increasingly with criminal conduct, that is heinous and ghastly enough to affect entire societies and regions. The formative source of modern international criminal law was the Nuremberg trials following the Second World War in which the leaders of Nazism were prosecuted for their part in genocide and atrocities across Europe. In 1998 an International criminal court was established in the Hague under what is known as the Rome Statute. This is specifically to try heads and members of governments who have taken part in crimes against humanity. Not all countries have agreed to take part, including Yemen, Libya, Iraq and the United States.
In the United States, criminal prosecutions typically are initiated by complaint issued by a judge or by indictment issued by a grand jury. As to felonies in Federal court, the Fifth Amendment to the United States Constitution requires indictment. The Federal requirement does not apply to the states, which have a diversity of practices. Three states (Connecticut, Pennsylvania, and Washington) and the District of Columbia do not use grand jury indictments at all. The Sixth Amendment guarantees a criminal defendant the right to a speedy and public trial, in both state and Federal courts, by an impartial jury of the State and district wherein the crime was committed, and to be informed of the nature and cause of the accusation; to be confronted with the witnesses against him; to have compulsory process for obtaining witnesses in his favor, and to have the assistance of Counsel for his defense. The interests of the state are represented by a prosecuting attorney. The defendant may defend himself pro se, and may act as his own attorney, if desired.
In most U.S. law schools, the basic course in criminal law is based upon the Model Penal Code and examination of Anglo-American common law. Crimes in the U.S. which are outlawed nearly universally, such as murder and rape are occasionally referred to as malum in se, while other crimes reflecting society's social attitudes and morality, such as laws prohibiting use of marijuana are referred to as malum prohibitum.
Criminal law in the United Kingdom derives from a number of diverse sources. The definitions of the different acts that constitute criminal offenses can be found in the common law (murder, manslaughter, conspiracy to defraud) as well as in thousands of independent and disparate statutes and more recently from supranational legal regimes such as the European Union. As the law lacks the criminal codes that have been instituted in the United States and civil law jurisdictions, there is no unifying thread to how crimes are defined, although there have been calls from the Law Commission for the situation to be remedied. Criminal trials are administered hierarchically, from magistrates' courts, through the Crown Courts and up to the High Court. Appeals are then made to the Court of Appeal and finally the House of Lords on matters of law.
Procedurally, offenses are classified as indictable and summary offenses; summary offenses may be tried before a magistrate without a jury, while indictable offenses are tried in a crown court before a jury. The distinction between the two is broadly between that of minor and serious offenses. At common law crimes are classified as either treason, felony or misdemeanor.
The way in which the criminal law is defined and understood in the United Kingdom is less exact than in the United States as there have been few official articulations on the subject. The body of criminal law is considerably more disorganized, thus finding any common thread to the law is very difficult. A consolidated English Criminal Code was drafted by the Law Commission in 1989 but, though codification has been debated since 1818, as of 2007 had not been implemented.
Many laws are enforced by threat of criminal punishment, and their particulars may vary widely from place to place. The entire universe of criminal law is too vast to intelligently catalog. Nevertheless, the following are some of the more known aspects of the criminal law.
The criminal law generally prohibits undesirable acts. Thus, proof of a crime requires proof of some act. Scholars label this the requirement of an actus reus or guilty act. Some crimes — particularly modern regulatory offenses — require no more, and they are known as strict liability offenses. Nevertheless, because of the potentially severe consequences of criminal conviction, judges at common law also sought proof of an intent to do some bad thing, the mens rea or guilty mind. As to crimes of which both actus reus and mens rea are requirements, judges have concluded that the elements must be present at precisely the same moment and it is not enough that they occurred sequentially at different times.
Actus reus is Latin for "guilty act" and is the physical element of committing a crime. It may be accomplished by an action, by threat of action, or exceptionally, by an omission to act. For example, the act of A striking B might suffice, or a parent's failure to give food to a young child also may provide the actus reus for a crime.
Where the actus reus is a failure to act, there must be a duty. A duty can arise through contract, a voluntary undertaking, a blood relation with whom one lives, and occasionally through one's official position. Duty also can arise from one's own creation of a dangerous situation. Occasional sources of duties for bystanders to accidents in Europe and North America are good samaritan laws, which can criminalize failure to help someone in distress (such as a drowning child).
An actus reus may be nullified by an absence of causation. For example, a crime involves harm to a person, the person's action must be the but for cause and proximate cause of the harm. If more than one cause exists (such as harm comes at the hands of more than one culprit) the act must have "more than a slight or trifling link" to the harm.
Causation is not broken simply because a victim is particularly vulnerable. This is known as the thin skull rule. However, it may be broken by an intervening act (novus actus interveniens) of a third party, the victim's own conduct, or another unpredictable event. A mistake in medical treatment typically will not sever the chain, unless the mistakes are in themselves "so potent in causing death."
Mens rea is the Latin phrase meaning "guilty mind." A guilty mind means an intention to commit some wrongful act. Intention under criminal law is separate from a person's motive. If Robin Hood robs from rich Sheriff Nottingham because his motive is to give the money to poor Maid Marion, his "good intentions" do not change his criminal intention to commit robbery.
A lower threshold of mens rea is satisfied when a defendant recognises an act is dangerous but decides to commit it anyway. This is recklessness. For instance, if C tears a gas meter from a wall to get the money inside, and knows this will let flammable gas escape into a neighbor's house, he could be liable for poisoning. Courts often consider whether the actor did recognize the danger, or alternatively ought to have recognized a risk. Of course, a requirement only that one ought to have recognized a danger (though he did not) is tantamount to erasing intent as a requirement. In this way, the importance of mens rea has been reduced in some areas of the criminal law.
Wrongfulness of intent also may vary the seriousness of an offense. A killing committed with specific intent to kill or with conscious recognition that death or serious bodily harm will result, would be murder, whereas a killing effected by reckless acts lacking such a consciousness could be manslaughter. On the other hand, it matters not who is actually harmed through a defendant's actions. The doctrine of transferred malice means, for instance, that if a man intends to strike a person with his belt, but the belt bounces off and hits another, mens rea is transferred from the intended target to the person who actually was struck.; though for an entirely different offense, such as breaking a window, one cannot transfer malice.
Not all crimes require bad intent, and alternatively, the threshold of culpability required may be reduced. For example, it might be sufficient to show that a defendant acted negligently, rather than intentionally or recklessly. In offenses of absolute liability, other than the prohibited act, it may not be necessary to show anything at all, even if the defendant would not normally be perceived to be at fault. Most strict liability offenses are created by statute, and often they are the result of ambiguous drafting unless legislation explicitly names an offense as one of strict liability.
A murder, defined broadly, is an unlawful killing or homicide. Unlawful killing is probably the act most frequently targeted by the criminal law. In many jurisdictions, the crime of murder is divided into various gradations of severity, such as murder in the first degree, based on intent. Malice is a required element of murder. Manslaughter is a lesser variety of killing committed in the absence of malice, brought about by reasonable provocation, or diminished capacity. Involuntary manslaughter, where it is recognized, is a killing that lacks all but the most attenuated guilty intent, recklessness.
Many criminal codes protect the physical integrity of the body. The crime of battery is traditionally understood as an unlawful touching, although this does not include everyday knocks and jolts to which people silently consent as the result of presence in a crowd. Creating a fear of imminent battery is an assault, and also may give rise to criminal liability. Non-consensual intercourse, or rape, is a particularly egregious form of battery.
Property often is protected by the criminal law. Trespassing is unlawful entry onto the real property of another. Many criminal codes provide penalties for conversion, embezzlement, theft, all of which involve deprivations of the value of property. Robbery is a theft by force.
Some criminal codes criminalize association with a criminal venture or involvement in criminality that does not actually come to fruition. Some examples are aiding, abetting, conspiracy, and attempt.
There are a variety of conditions that will tend to negate elements of a crime (particularly the intent element) that are known as defenses. The label may be apt in jurisdictions where the accused may be assigned some burden before a tribunal. However, in many jurisdictions, the entire burden to prove a crime is on the government, which also must prove the absence of these defenses, where implicated. In other words, in many jurisdictions the absence of these so-called defenses is treated as an element of the crime. So-called defenses may provide partial or total refuge from punishment.
Insanity or mental disorder (Australia and Canada), may negate the intent of any crime, although it pertains only to those crimes having an intent element. A variety of rules have been advanced to define what, precisely, constitutes criminal insanity. The most common definitions involve either an actor's lack of understanding of the wrongfulness of the offending conduct, or the actor's inability to conform conduct to the law. If one succeeds in being declared "not guilty by reason of insanity," then the result frequently is treatment mental hospital, although some jurisdictions provide the sentencing authority with flexibility.
Automatism is a state where the muscles act without any control by the mind, or with a lack of consciousness. One may suddenly fall ill, into a dream like state as a result of post traumatic stress, or even be "attacked by a swarm of bees" and go into an automatic spell. However to be classed as an "automaton" means there must have been a total destruction of voluntary control, which does not include a partial loss of consciousness as the result of driving for too long. Where the onset of loss of bodily control was blameworthy, for example the result of voluntary drug use, it may be a defense only to specific intent crimes.
In some jurisdictions, intoxication may negate specific intent, a particular kind of mens rea applicable only to some crimes. For example, lack of specific intent might reduce murder to manslaughter. Voluntary intoxication nevertheless often will provide basic intent, for example the intent required for manslaughter. On the other hand, involuntary intoxication, for example when another put alcohol in what the person believed to be a non-alcoholic drink, without their knowledge, may give rise to no inference of basic intent.
"I made a mistake" is a defense in some jurisdictions if the mistake is about a fact and is genuine. For example, a charge of battery on a police officer may be negated by genuine (and perhaps reasonable) mistake of fact that the person battered was a criminal and not an officer.
Self-defense is, in general, some reasonable action taken in protection of self. An act taken in self-defense often is not a crime at all; no punishment will be imposed. To qualify, any defensive force must be proportionate to the threat. Use of a firearm in response to a non-lethal threat is a typical example of disproportionate force.
One who is "under duress" is forced into an unlawful act. Duress can be a defense in many jurisdictions, although not for the most serious crimes of murder, attempted murder, being an accessory to murder and in many countries, treason. The duress must involve the threat of imminent peril of death or serious injury, operating on the defendant's mind and overbearing his will. Threats to third persons may qualify. The defendant must reasonably believe the threat, and there is no defense if "a sober person of reasonable firmness, sharing the characteristics of the accused" would have responded differently. Age, pregnancy, physical disability, mental illness, sexuality have been considered, although basic intelligence has been rejected as a criterion.
The accused must not have foregone some safe avenue of escape. The duress must have been an order to do something specific, so that one cannot be threatened with harm to repay money and then choose to rob a bank to repay it. If one puts himself in a position where he could be threatened, duress may not be a viable defense.
Criminal law distinguishes crimes from civil wrongs such as tort or breach of contract. Criminal law has been seen as a system of regulating the behavior of individuals and groups in relation to societal norms, whereas civil law is aimed primarily at the relationship between private individuals and their rights and obligations under the law.
However, many ancient legal systems did not clearly define a distinction between criminal and civil law, and in England there was little difference until the codification of criminal law occurred in the late nineteenth century. In most U.S. law schools, the basic course in criminal law is based upon the English common criminal law of 1750 (with some minor American modifications like the clarification of mens rea in the Model Penal Code).
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