
Common law, also known as case law, is a system of law that draws from institutionalized opinions and interpretations from judicial authorities and public juries. It relies on detailed records of similar situations and statutes because there is no official legal code that can be applied to a case at hand. Common law is developed by judges through legal opinions, as opposed to statutes adopted through the legislative process or regulations issued by the executive branch. Common law crimes are thus crimes that were originally defined by judges. Common law places an emphasis on precedent while allowing some freedom for interpretation. In the context of criminal law, common law offences are found in various jurisdictions, including the United States, the United Kingdom, Canada, and New Zealand. While some jurisdictions have moved towards abolishing common law crimes in favour of statutory definitions, others continue to recognize and apply them.
| Characteristics | Values |
|---|---|
| Definition | Common law is law developed by judges through legal opinions, as opposed to statutes adopted through the legislative process or regulations issued by the executive branch. |
| Origin | Common law, also known as case law, originates from medieval England. |
| Application | Common law applies in common-law countries such as the United States, the United Kingdom, Canada, India, and New Zealand. |
| Basis | Common law relies on detailed records of similar situations and statutes, forming precedents that guide future cases. |
| Interpretation | Common law allows for interpretation, adapting the law to situations not contemplated by the legislature. |
| Consistency | Common law promotes stability and consistency in the legal system by applying the same standards of interpretation. |
| Flexibility | Common law can be modified or deviated from by lower courts if it is outdated or substantially different from the current case. |
| Criminal Law | Common law criminal laws include major felonies like murder, robbery, and manslaughter, and misdemeanors like assault and battery. |
| Defenses | Defenses in common law criminal cases include failure of proof, mistakes, and insanity. |
| Sentencing | Common law sentencing varies, with some countries like the US categorizing punishment levels, while others like the UK use a "one size fits all" approach. |
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Common law marriage
Common-law marriage, also known as non-ceremonial marriage, is a legal framework that allows couples to be considered married without having formally registered their union or participated in a marriage ceremony. It is also referred to as a sui iuris marriage, informal marriage, de facto marriage, more uxorio, or marriage by habit and repute. Common-law marriage is not common in the US, but a number of states have statutes that allow for it if certain requirements are met. These requirements include the capacity to marry, intent to be married, cohabitation, and holding themselves out to friends, family, and the community as "married".
The concept of common-law marriage originated in medieval England, where it was recognized as a valid marriage when the parties stated that they took each other as wife and husband, even in the absence of any witnesses. In medieval Europe, marriage came under the jurisdiction of canon law, which did not require witnesses for a marriage to be valid. However, the Catholic Church forbade clandestine marriage at the Fourth Lateran Council in 1215, requiring all marriages to be announced in a church by a priest. The Council of Trent (1545-1563) introduced more specific requirements, including the presence of a witness such as a priest.
In the United States, common-law marriage has existed since colonial times. However, in 1753, the Parliament of Great Britain passed the Clandestine Marriages Act, which ended common-law marriages in England and Wales. This Act required subjects of England and Wales to be married by the Church of England, but it did not apply to the American colonies. Common-law marriage survived in colonial America and is still recognized in some states today.
Today, common-law marriage is recognized in seven states and the District of Columbia, while nine states recognize it with some restrictions. States that allow common-law marriage can create their own rules for who qualifies. While there is no statutory requirement for the length of time a couple needs to live together, generally, the longer they live together, the stronger their case is for common-law marriage.
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Common law offences
Common law marriage, also known as a non-ceremonial marriage, is an example of common law in action today. It grants similar rights to those with a marriage license to couples who are not officially married, provided certain conditions are met.
In the US, common law is derived from its original appearance in medieval England. Today, both the US and the UK operate under a dual system of both common and civil law. Common law is still very much in effect in the US and elsewhere today, and its ability to leave the legal code open to interpretation is becoming increasingly important as technology advances.
At common law, there were nine major felonies: murder, robbery, manslaughter, rape, sodomy, larceny, arson, mayhem, and burglary. There were also various misdemeanours, including assault, battery, false imprisonment, perjury, and intimidation of jurors. However, the US Code is far more extensive than common law, and Congress has limited power to make criminal laws. This power is generally reserved for the states, and state criminal codes, such as New York's, are far more complicated than the US Code.
In Canada, the consolidation of criminal law in the Criminal Code, enacted in 1953, involved the abolition of all common law offences except contempt of court. In England and Wales, the Law Commission's programme of codification of criminal law included the aim of abolishing all remaining common law offences and replacing them with offences precisely defined by statute. Common law offences were seen as unacceptably vague and open to development by the courts in ways that might offend the principle of certainty. However, this has not been completed, so some common law offences still exist.
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Common law vs civil law
There are two main types of legal systems in the world: Common Law and Civil Law. Common law, also known as case law, draws from institutionalized opinions and interpretations from judicial authorities and public juries. It relies on detailed records of similar situations and statutes because there is no official legal code that can be applied to a specific case. It originated in medieval England and is typically adopted by countries that were former British colonies or protectorates, including the United States. Common law is less prescriptive than civil law, and generally, everything is permitted that is not expressly prohibited by law.
Civil law, on the other hand, is a comprehensive, codified set of legal statutes created by legislators. It is rooted in the Roman Empire and was comprehensively codified and disseminated starting in the 19th century, with notable examples including France's Napoleonic Code and Germany's Bürgerliches Gesetzbuch. Civil law is generally more prescriptive than common law, and there are a number of provisions implied into a contract. Civil law systems rely on legal codes that function as the primary source of law, and judges tend to give less weight to judicial precedent.
In the context of criminal law, common law refers to law developed by judges through legal opinions rather than statutes adopted through the legislative process. Common law crimes are those originally defined by judges. For example, in the United States, there were nine major felonies at common law, including murder, robbery, and manslaughter. States have the power to pass criminal laws, and their courts may rely on common-law definitions when their statutes lack specific definitions. Federal criminal law in the United States is codified in Title 18 of the U.S. Code, which designates various conduct as federal crimes, such as arson, use of chemical weapons, and kidnapping.
While civil law is generally associated with non-criminal disputes, it is important to note that civil law codes can introduce major reforms or start anew, going beyond the mere compilation of statutes. In the United States, for instance, the Model Penal Code serves as a reference for both civil and common law systems. Additionally, Louisiana's private civil law is heavily based on French and Spanish codes, marking a departure from English common law.
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Common law jurisdictions
Common law, also known as case law, is a legal system that places importance on precedent and allows some freedom for interpretation. It is derived from judicial decisions, as opposed to statutes or constitutions. Common law systems rely on caselaw and legal precedent to guide their decisions, while civil law systems rely primarily on codes and statutes. Common law marriage, which grants similar rights to married couples without a marriage license, is an example of common law in action today.
The US, UK, and many former colonies, including one-third of the world's population, live in common law jurisdictions or mixed legal systems that integrate common law and civil law. Common law originated in medieval England and was spread across the British Isles, then to Ireland and overseas colonies by the British Empire. Common law systems give great weight to judicial precedent and the style of reasoning inherited from the English legal system.
In common law jurisdictions, several stages of research and analysis are required to determine "what the law is" in a given situation. This includes ascertaining the facts, locating relevant statutes and cases, extracting principles, analogies, and statements by courts, and determining how the next court is likely to rule. The decisions of a court are binding only in a particular jurisdiction, and even within a jurisdiction, some courts have more power than others. For example, decisions by appellate courts are typically binding on lower courts in the same jurisdiction, while decisions of lower courts are only non-binding persuasive authority.
Common law promotes stability and consistency, as outcomes are based on previous caselaw rather than subjective viewpoints. It also allows for efficiency, as judges only need to follow precedent, and adaptability to unforeseen situations not contemplated by the legislature. However, past decisions can lead to the marginalization or disempowerment of certain groups, and societal changes may be needed to prompt a judicial body to overturn the precedent.
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Common law and insanity defence
The insanity defence is a legal concept that has existed for several centuries, with its roots in ancient Greece and Rome. The defence is based on the idea that a defendant with a mental defect should not be held criminally responsible for their actions. In other words, criminal sanctions are meant to promote public safety and deter future crimes, but without blameworthiness, these sanctions are not effective or justified.
The insanity defence was established in common law in 12th-century England and has since been used in various forms around the world. In the 13th century, the idea of moral wrongfulness was codified into English law, and a crime was defined as consisting of two elements: actus reus and mens rea. Mens rea, or "guilty mind," refers to the criminal intent behind an action. The insanity defence thus provides a way to determine which persons should be held criminally responsible for their actions.
One of the most well-known cases involving the insanity defence is that of M'Naghten, a Scottish woodturner who attempted to assassinate the British Prime Minister in 1843. M'Naghten killed the Prime Minister's secretary, Edward Drummond, by mistake. He was found not guilty by reason of insanity, as nine witnesses testified to his insanity, and it was clear that he did not understand the nature and quality of his actions or that they were wrong. This case led to the establishment of the M'Naghten Rules, which became the basis for the law governing legal responsibility in cases of insanity in England and were adopted with few modifications in the United States and other parts of the world.
The M'Naghten Rule, as it is known, states that a defendant is deemed insane if they did not understand what they were doing or were unable to distinguish right from wrong due to a "disease of the mind." This rule focuses on the defendant's cognition and has been criticised for being too rigid. As a result, other tests, such as the irresistible impulse test and the Model Penal Code test, have been developed to address the nuances of mental disabilities and provide a more modern standard for the insanity defence.
While the insanity defence has been an important aspect of the criminal justice system, it has also been controversial. In some cases, such as the attempted assassination of President Ronald Reagan by John Hinckley, the successful use of the insanity defence led to public outrage and the reform of insanity laws in several states. The defence has been eliminated entirely in some states, while in others, defendants may be found "guilty but insane" and sentenced to psychiatric institutionalisation.
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Frequently asked questions
Common law, also known as case law, draws from institutionalized opinions and interpretations from judicial authorities and public juries. Common law relies on detailed records of similar situations and statutes because there is no official legal code that can be applied to a case.
A common law crime is a crime that was originally defined by judges. Some states in the US have abolished common law crimes, while others have chosen to continue to recognize them.
Common law places an emphasis on precedent while allowing some freedom for interpretation. In criminal law, common law relies on two elements to prove the commission of a crime: actus reus (the act) and mens rea (the intent).
At common law, there were nine major felonies: Murder, Robbery, Manslaughter, Rape, Sodomy, Larceny, Arson, Mayhem, and Burglary. There were also various misdemeanors, including assault, battery, false imprisonment, perjury, and intimidation of jurors.



















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