
The preemption doctrine is a concept in US law that refers to the idea that a higher authority of law will displace a lower authority of law in the event of a conflict. This is supported by the Supremacy Clause in Article VI of the US Constitution, which states that federal law is the supreme law of the land. This means that federal law will supersede, or preempt, state law in the case of a conflict. This is applicable regardless of whether the conflicting laws come from legislatures, courts, administrative agencies, or constitutions. There are three types of preemption: conflict preemption, field preemption, and express preemption.
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Supremacy Clause
The Supremacy Clause, found in Article VI of the US Constitution, is a key component of the country's legal framework, underpinning the concept of federal preemption. This clause establishes the primacy of federal law over state law in the event of a conflict between the two. In essence, it asserts that the Constitution, federal laws, and treaties made under the authority of the United States take precedence over any contrary provisions in state constitutions or laws. This clause ensures that judges across all states adhere to the federal government's legal framework, even when state laws conflict.
The Supremacy Clause is a powerful tool for maintaining uniformity and consistency in the application of laws across the country. It grants the federal government broad powers to create, regulate, and enforce laws that supersede those of individual states. This is particularly relevant when addressing issues that require a standardised approach, such as commerce and economic regulations. For example, the Voting Rights Act, enacted by Congress, takes precedence over state constitutions, ensuring a uniform framework for voting rights nationwide.
The application of the Supremacy Clause and federal preemption is not absolute and is subject to careful consideration by the courts. The analysis of preemption cases typically starts with a presumption against preemption, acknowledging the sovereignty of states as independent entities within the federal system. This presumption is grounded in the Constitution itself and is further supported by policy considerations. Recognising the potential drawbacks of preemption, such as stifling innovation in policy approaches across states, is essential.
Despite this presumption, there are several scenarios where federal preemption comes into play. Firstly, when a federal statute or regulation expressly conflicts with a state law, the federal law generally takes precedence. This is often indicated by the presence of an express preemption clause in the federal legislation, signalling the legislative branch's intent to preempt state laws. Secondly, implied preemption occurs when one of three conditions are met: when a local ordinance prohibits an act permitted by the state legislature, when a local ordinance permits an act prohibited by the state legislature, or when there is a clear legislative intent to preempt state law in a specific field.
In summary, the Supremacy Clause serves as the legal foundation for federal preemption, ensuring that federal law supersedes state law in cases of conflict. This clause is integral to maintaining a uniform legal framework across the nation, particularly in areas where consistency is crucial, such as commerce and economic regulations. However, the application of preemption is carefully balanced, recognising the importance of state sovereignty and the potential benefits of policy diversity.
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Implied preemption
The preemption doctrine is based on the idea that a higher authority of law will displace the law of a lower authority when the two conflict. This is supported by the Supremacy Clause (Article VI, Clause 2) of the US Constitution, which states:
> This Constitution, and the Laws of the United States which shall be made in Pursuance thereof; and all Treaties made, or which shall be made, under the Authority of the United States, shall be the Supreme law of the land; and the Judges in every State shall be bound thereby, any Thing in the Constitution or Laws of any State to the Contrary notwithstanding.
- A local ordinance prohibits an act that is permitted by the state legislature.
- A local ordinance permits an act that is prohibited by the state legislature.
- There is a clear legislative intent that the "field" is preempted by state law.
The "field" is usually defined as an extensive scope of state regulation that reflects a state's intent to preempt all local regulations in a particular area. For example, in the mortgage foreclosure process, the state law addresses an area that has traditionally been a matter for the state.
Courts have developed various tests to determine when a state legislature has preempted a particular field. For example, in the 1993 case of Allied Vending Co. v Bowie, the court issued a seven-part test to determine whether a state legislature has preempted a field by implication. This included questions such as whether local laws existed prior to the enactment of state laws on the same subject matter, whether the state expressly gives concurrent authority, and whether the state agency administering the law has the legal authority to act.
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Federalism
The concept of federalism, which is integral to the US system of government, is a key factor in understanding the constitutional basis for preemption. Federalism, as outlined in the US Constitution, establishes a system of divided governmental powers between the national government and the states. This division of powers is a fundamental principle that shapes the relationship between the federal and state governments and is crucial in determining the scope and reach of preemption.
The Constitution sets out the framework for federalism, with the Supremacy Clause (Article VI, Clause 2) being a pivotal provision. This clause establishes the primacy of federal law over state law, stating that the "Constitution, and the Laws of the United States which shall be made in Pursuance thereof... shall be the supreme Law of the Land." This means that when there is a conflict between federal and state laws, the federal law prevails and preempts the state law. The Supremacy Clause is a cornerstone of preemption doctrine, providing the constitutional authority for federal laws to supersede and displace state laws on certain matters.
Another important aspect of federalism in the context of preemption is the enumeration of powers granted to Congress in Article I, Section 8 of the Constitution. This section outlines the specific powers of Congress, including areas such as regulating interstate and foreign commerce, establishing uniform laws on bankruptcy and naturalization, and providing for the punishment of counterfeiting. When Congress acts within these enumerated powers to pass laws, those laws can preempt state laws on the same subject matter. For example, the Commerce Clause has been widely interpreted to give Congress broad authority to regulate economic activity that affects interstate commerce, and laws passed under this clause often have preemptive effect.
Additionally, the Tenth Amendment, which is part of the Bill of Rights, plays a significant role in federalism and preemption. This amendment states that "powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people." In other words, it affirms that any powers not specifically granted to the federal government by the Constitution are retained by the states or the people. This amendment underscores the limited nature of federal power and reinforces the idea that states retain significant authority in areas not expressly preempted by federal law.
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Conflict preemption
For example, in Mutual Pharmaceutical Co. v. Bartlett, federal law enacted under Congress' Commerce Clause authority prohibited generic drug manufacturers from changing the composition or labelling of drugs approved by the Food and Drug Administration (FDA). Thus, state tort law could not force a generic drug manufacturer to add additional information to the FDA-approved label or hold it liable for not doing so. This is an example of conflict preemption, as the federal law directly conflicted with and took precedence over the state law.
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Express preemption
The preemption doctrine is based on the idea that a higher authority of law will override the law of a lower authority when the two conflict. When state law and federal law conflict, federal law supersedes state law, as per the Supremacy Clause of the US Constitution.
Courts begin with a presumption that state laws are not preempted. However, in cases where state law interferes with either the debtor's fresh start or a creditor's right to equal distribution, preemption may be deemed necessary. For example, in California, the state's one-action rule and protections given to CalPERS were held to be unconstitutional due to preemption by federal law.
In summary, express preemption occurs when a state law directly conflicts with a local power, and Congress has explicitly stated that the state law is preempted. This is a complex policy issue that requires careful consideration, as it involves the balance of power between federal and state authorities.
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Frequently asked questions
Preemption is the idea that a higher authority of law will displace the law of a lower authority of law when the two authorities come into conflict.
The Supremacy Clause (Article VI, clause 2) of the United States Constitution states that federal law is the "supreme law of the land." This means that federal law will supersede state law when the two conflict.
There are two types of preemption: express preemption and implied preemption. Express preemption occurs when a federal statute or regulation expressly conflicts with a state law. Implied preemption occurs when one of three things happen: when the local ordinance prohibits an act permitted by the state legislature, when a local ordinance permits an act prohibited by the state legislature, or when there is clear legislative intent that the "field" is preempted by state law.
In Mutual Pharmaceutical Co. v. Bartlett, federal law enacted under Congress' Commerce Clause authority prohibited state tort law from forcing a generic drug manufacturer to add information to an FDA-approved label.


















