
Public law is a branch of law that governs the relationships between individuals and the state, focusing on how laws and regulations impact society as a whole. It encompasses several key subdivisions, two of which are constitutional law and administrative law. Constitutional law interprets and applies the provisions of a government's constitution, ensuring that civil rights are upheld. Administrative law, on the other hand, involves the regulations created by governmental agencies that implement legislative laws.
| Characteristics | Values |
|---|---|
| Definition | Public law governs the relationships between individuals and government entities, focusing on how laws and regulations impact society as a whole. |
| Constitutional law is a body of law that defines the role, powers, and structure of different entities within a state, namely the executive, the parliament or legislature, and the judiciary, as well as the basic rights of citizens and their relationship with their governments. | |
| Administrative law refers to the body of law that regulates bureaucratic managerial procedures and defines the powers of administrative agencies. | |
| Constitutional law is enshrined in a written document, the Constitution, sometimes together with amendments or other constitutional laws. | |
| Common law nations, such as those in the Commonwealth and the United States, derive their legal systems from that of the United Kingdom, and as such, place emphasis on judicial precedent. | |
| Civil law jurisdictions place less emphasis on judicial review and only the parliament or legislature has the power to effect law. | |
| Constitutional law deals with fundamental principles by which the government exercises its authority. | |
| Constitutional law can be considered second-order rule-making or rules about making rules to exercise power. | |
| Constitutional law governs the relationships between the judiciary, the legislature, and the executive with the bodies under its authority. | |
| Human rights law in these countries is largely built on legal precedent in the courts' interpretation of constitutional law. | |
| Public law helps society hold organizations that should represent their best interests accountable when they transgress. |
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What You'll Learn

Administrative law: regulations created by government agencies
Administrative law is a branch of law that focuses on the creation and operation of administrative agencies. It is closely linked to constitutional law and is a cornerstone of public law. Administrative law helps ensure that public organisations operate fairly and reasonably, and it can be used to query and address misuses of the law by public bodies.
Administrative agencies are created by Congress through "enabling legislation" and are authorised to promulgate regulations that carry the same force as statutory law. These agencies are created to protect the public interest and are delegated power by Congress (or in the case of a state agency, the state legislature) to carry out certain prerogatives. Agencies are formed through their own organic statutes, which establish new laws, and in doing so, create the respective agencies to interpret, administer, and enforce those laws.
The powers granted to administrative agencies are of particular importance, along with the substantive rules that such agencies make and the legal relationships between agencies, other government bodies, and the public. Federal agencies provide detailed rules and guidance to clarify and properly execute statutes, and they cannot act unless Congress has delegated the authority for them to do so. Rulemaking is the process used by federal agencies to create, amend, or repeal rules, and Congress grants rulemaking authority to federal agencies to implement legislative statutes. These rules are published in two official sources: the Federal Register and the Code of Federal Regulations.
The Administrative Procedure Act (APA) is a statute that governs the procedures used by federal agencies and state agencies in their administration and regulation. The APA requires a process that includes publication of proposed rules, a period for comments and participation, and adoption and publication of the final rule. The final rule must be a logical outgrowth of the proposed rule and must display the agency's consideration of all comments received.
The level of deference afforded to administrative agencies by the courts has varied over time. The Chevron deference, for example, applied an extremely deferential standard of review, in which courts deferred to agency interpretations of statutes unless they were deemed unreasonable. If the Chevron or Auer deference did not apply, then the Skidmore deference applied, in which courts did not give a binding deference to the agency's interpretation.
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Criminal law: illegal actions and their punishments
Criminal law is a system of laws that deals with crimes and the punishment of individuals who commit them. It is distinct from civil law, which involves disputes between individuals over their rights. In a criminal prosecution, the government decides whether to punish an individual for an act or omission that violates the law. Each state has its own criminal code, detailing prohibited conduct and the mental state or intent required for guilt, alongside the punishments for criminal offences.
Criminal acts can be divided into several categories, including crimes against a person, crimes against property, inchoate crimes, statutory crimes, and financial crimes. Crimes against a person are those that result in physical or mental harm to another person and can be further divided into two categories: homicide and other violent crimes. Homicide includes first-degree murder, voluntary manslaughter, and vehicular homicide. Violent crimes include sexual abuse, sexual assault, and grand theft, and often carry steep penalties.
Crimes against property involve interference with another party's property, such as grand theft. Inchoate crimes refer to the planning or attempt of a crime and can be punished similarly to the actual crime or with lesser severity. Statutory crimes are prohibited by statute, including alcohol-related crimes, drug crimes, traffic offences, and financial/white-collar crimes. These are prohibited to deter individuals from engaging in them. Drug crimes include possession, manufacturing, and trafficking, while traffic offences cover DUI, driving without a licence, and vehicular assault. Financial crimes involve deception or fraud for financial gain and can be committed by anyone, not just corporate officers.
Defences in criminal prosecutions include failure of proof, duress, intoxication, and insanity. Failure of proof is the simplest defence, claiming that the prosecution cannot prove an element of the offence. Duress can be pleaded if an individual was forced to act illegally through force or threat of force. Intoxication can be a defence for involuntarily intoxicated individuals and, in some cases, for those voluntarily intoxicated for crimes requiring a specific mental state. Finally, an insane individual cannot form the requisite mental state and thus cannot be found guilty.
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Human rights law: protecting individual rights
Human rights law is a cornerstone of public law, which exists to protect individuals and ensure law and order within society. It is a body of law that defines the basic rights of citizens and their relationship with their governments. Human rights law is largely built on legal precedent in the courts' interpretation of constitutional law.
The Universal Declaration of Human Rights (UDHR), adopted by the UN General Assembly in 1948, was the first legal document to set out the fundamental human rights to be universally protected. The UDHR's 30 articles provide the principles and building blocks of current and future human rights conventions, treaties, and other legal instruments. The UDHR, together with the International Covenant on Civil and Political Rights and its two Optional Protocols, and the International Covenant on Economic, Social and Cultural Rights, form the so-called International Bill of Human Rights.
Human rights are inalienable and indivisible. They should not be taken away, except in specific situations and according to due process. For example, the right to liberty may be restricted if a person is found guilty of a crime by a court of law. However, violating economic, social, and cultural rights can negatively affect many other rights.
At the national level, the protection of human rights is carried out by courts, ombudsman offices, human rights committees, councils, and parliamentary committees. The laws, policies, procedures, and mechanisms in place at the national level are key for the enjoyment of human rights in each country. It is crucial that human rights are part of the national constitutional and legal systems, and that justice professionals are trained to apply human rights standards.
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Tax law: rules of government taxation
Tax law, also known as revenue law, is a body of rules and procedures that public or sanctioned authorities use to assess and collect taxes. This area of law is complex and covers various types of taxes, such as income tax, estate tax, business tax, employment/payroll tax, property tax, gift tax, and exports/imports tax. Tax law is part of public law and is influenced by constitutional law, which grants governments the power to tax and spend for the welfare of the population.
The rules of government taxation are established through different sources, including constitutional provisions, legislative enactments, and regulatory documents. In the United States, the Constitution empowers Congress to enact tax laws, which are primarily found in the Internal Revenue Code (IRC) of 1986. The IRC is complex and must be interpreted in conjunction with Treasury Regulations, court decisions, and other guidance issued by the Internal Revenue Service (IRS).
Treasury Regulations, often referred to as federal tax regulations, provide the official interpretation of the IRC by the U.S. Department of the Treasury. These regulations guide taxpayers on complying with the IRC's requirements and can be found in Title 26 of the Code of Federal Regulations (26 CFR). Regulatory documents related to taxation are published in the Federal Register and the Internal Revenue Bulletin, ensuring transparency and accessibility.
The Office of Tax Policy within the U.S. Department of the Treasury plays a crucial role in developing and implementing tax policies and programs. It reviews regulations and rulings, negotiates tax treaties, and provides economic and legal policy analysis for domestic and international tax decisions. The "Greenbook" is released alongside the Administration's Budget, offering explanations of revenue proposals and fiscal plans.
Tax law education is a specialization for professionals such as accountants, tax agents, and lawyers. These practitioners often pursue advanced degrees, such as a Master of Laws in Taxation (LL.M.), to deepen their understanding of taxation and provide specialized services to their clients. Tax law is a complex and dynamic field, requiring ongoing study and adaptation to legislative and regulatory changes.
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International law: relations between nations
International law is a set of rules and principles that govern the relations and conduct of sovereign states with each other, as well as with international organisations and individuals. The term "international law" was first used by Jeremy Bentham in 1789, to refer to the relationships between states. This definition has been criticised for its narrow scope, and Lassa Oppenheim later defined it as "a law between sovereign and equal states based on the common consent of these states", a definition largely adopted by international legal scholars.
International law includes international custom (general state practice accepted as law), treaties, and general principles of law recognised by most national legal systems. Treaties are binding agreements between nations that govern the rights and obligations of participating countries. Sovereign states use treaties to cooperate on various issues, such as military defence, environmental conservation, and trade. Customary law arises from patterns of behaviour in nations, where states follow certain practices out of a sense of legal obligation, and those practices develop into international law.
International law is an independent system of law that exists outside the legal orders of particular states. It is not strictly enforceable upon nations or other international actors, but treaties and the possibility of economic sanctions create heavy incentives for abiding by international law. The system is sustained by reciprocity or a sense of enlightened self-interest. States that breach international rules suffer a decline in credibility that may prejudice them in future relations with other states.
International law covers a wide range of issues, including trade, human rights, diplomacy, environmental preservation, and war crimes. Different international bodies, such as the United Nations and World Trade Organization, are responsible for overseeing these issues. The goal of international law is to promote peace and order between nations.
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Frequently asked questions
Public law is a branch of law that governs the relationships between individuals and governmental entities, focusing on how laws and regulations impact society as a whole. It is closely linked to constitutional law and administrative law.
Constitutional law is a type of public law that interprets the meaning of a government's constitution as it applies to citizens. It deals with the fundamental principles by which a government exercises its authority and defines the role, powers, and structure of different entities within a state.
Public law concerns the relationships of individuals with their governments and societies, whereas private law refers to legal dealings between individuals or private institutions, such as corporations.
Two examples of public law are constitutional law and administrative law. Constitutional law interprets the prescriptions of a government's written constitution and ensures that civil rights are upheld. Administrative law involves the regulations created by governmental agencies that implement legislative laws.
A famous example of constitutional law in practice is the 1954 case of Brown v. Board of Education, where the Supreme Court ruled that racial segregation in schools was unconstitutional, interpreting the Fourteenth Amendment of the US Constitution.


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