Criminal

Criminal law, a fundamental component of the legal system, is the body of law that pertains to crime. It prescribes conduct perceived as threatening, harmful, or otherwise endangering to the property, health, safety, and moral welfare of people, including oneself. Most criminal law is established by statute, which is to say that the laws are enacted by a legislature. It includes the punishment of people who violate these laws. Criminal law differs from civil law, where emphasis is more on dispute resolution and victim compensation than on punishment.

Nature and Purpose

The primary objective of criminal law is deterrence and punishment, while civil law is individual compensation. Criminal offences consist of two distinct elements; the physical act (the actus reus, guilty act) and the requisite mental state with which the act is done (the mens rea, guilty mind). For example, in murder, the 'actus reus' is the unlawful killing of a person, while the 'mens rea' is malice aforethought or intention to kill.

Classification of Crimes

Crimes are often classified into categories based on their severity. These categories typically include felonies, misdemeanors, and infractions. Felonies are the most serious type of crime, often punishable by imprisonment for more than one year or by death. Examples include murder, rape, and robbery. Misdemeanors are less serious offenses compared to felonies, usually punishable by fines or imprisonment for less than one year. Infractions are minor offenses such as traffic violations and are usually punishable by fines only.

Elements of a Crime

An understanding of the elements of a crime requires an analysis of its specific components. Most crimes feature four elements: a mental state, conduct, causation, and harm. The mental state, or mens rea, refers to the state of mind that a person must have at the time of committing the crime. Conduct, or actus reus, involves the physical act or unlawful omission. Causation must be established, showing that the defendant's actions caused the harm or damage. Finally, harm must be demonstrated, which can be physical injury, financial loss, or other forms of damage.

Legal Defenses in Criminal Law

Defendants charged with crimes can avail themselves of numerous defenses. Some common defenses include insanity, duress, self-defense, and mistake of fact. These defenses can completely exonerate the defendant or reduce their level of culpability. The insanity defense, for instance, is based on the belief that the punishment of a mentally disturbed person who commits a crime is inappropriate. Self-defense is commonly used when a person is accused of a violent crime, where the defendant asserts that their actions were necessary to protect themselves from harm.

Procedural Safeguards

Criminal law is also characterized by an array of procedural safeguards designed to protect the rights of the accused. These include the right to a fair and public trial, the right to be represented by an attorney, the right against self-incrimination, and the right to a speedy trial. These safeguards are enshrined in various legal documents and principles, such as the United States Constitution and the Universal Declaration of Human Rights.


Criminal law serves as a mechanism for maintaining public order and administering justice. It punishes behavior that threatens the safety and well-being of society, and in doing so, upholds social norms and peace. While it aims to deter and punish, it also offers protection and fairness to those accused of crimes through its procedural safeguards. Understanding the balance between these elements is crucial for the administration of justice and the maintenance of a stable and just society.

The complexity and nuance of criminal law are vast, and its application varies significantly across different jurisdictions. However, the underlying principles of deterrence, punishment, protection of society, and fairness to the accused form the cornerstone of criminal law globally.

Glossary of Criminal Law Terms