
In the US, federal law takes precedence over state law in the event of a contradiction between the two, according to the Supremacy Clause, which is part of Article VI of the Constitution. This is known as the doctrine of pre-emption. However, the federal government does not always intervene when state and federal laws contradict, as long as the state law does not affect national security or international relations. For example, in 2012, voters in Colorado and Washington state voted to legalize marijuana, despite federal law prohibiting its use. Similarly, while prostitution is illegal under federal law, it has been legalized in certain counties in Nevada, without intervention from the federal government.
| Characteristics | Values |
|---|---|
| Name of law that applies when state and federal laws disagree | Supremacy Clause |
| Part of | Article VI of the Constitution |
| Contains | Doctrine of pre-emption |
| States | Federal government wins in case of conflicting legislation |
| Example | Arizona's immigration law |
| Exception | Federal government has not always intervened when state law contradicts federal law |
| Example of exception | Legalization of prostitution in certain counties in Nevada |
| Recent example | Marijuana legalization in Colorado and Washington state in 2012 |
| Interpretation | Federal statutes and treaties must be within the parameters of the Constitution |
| Federal law takes priority over conflicting state law | |
| Federal law wins regardless of the order of enactment |
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What You'll Learn

The Supremacy Clause
The clause was introduced as part of the New Jersey Plan during the Federal Convention of 1787 and passed unanimously. It was a response to the lack of a similar provision in the Articles of Confederation, which governed the US from 1781 to 1789. The absence of such a clause meant that federal statutes did not bind state courts unless state legislation implemented them. The Supremacy Clause was not a major point of contention during the Constitutional Convention, but it did generate controversy during debates over the Constitution's ratification. However, advocates of federal supremacy prevailed, and the Constitution was ratified in 1788 with the inclusion of the Supremacy Clause.
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Marijuana laws
In the United States, marijuana possession and distribution are federal crimes under the Controlled Substances Act (CSA). However, this has not stopped several states from legalizing marijuana for adult or medicinal use. This contradiction between federal and state laws has led to a complex legal situation.
The Supremacy Clause, which is part of Article VI of the US Constitution, states that federal law is the "supreme Law of the Land". This means that federal law takes priority over state law in cases of conflicting legislation. However, the Tenth Amendment's "anti-commandeering rule" prohibits Congress from requiring state agents to enforce federal marijuana laws, as this would be unconstitutional commandeering of a state's resources.
The federal government has not consistently enforced federal marijuana laws in states that have legalized its use. For example, in 2013, the Department of Justice issued a statement, known as "the Cole memo", clarifying that their approach to enforcement would focus on certain areas, such as preventing the distribution of marijuana to minors and preventing revenue from marijuana sales from going to criminal enterprises. The memo also made it clear that states in which marijuana use is legal are responsible for establishing strict regulatory systems.
In addition, courts have generally held that a state law is only preempted by the CSA if it is "physically impossible" to comply with both state and federal law, or if the state law stands as an obstacle to the CSA. This is not the case with carefully crafted state medical marijuana programs, which do not require state workers to violate federal law. Instead, they regulate private individuals who choose to grow or dispense marijuana.
In 2018, the US Supreme Court overturned a federal law, PASPA, which sought to prohibit states from authorizing sports gambling. The court's decision was based on the same constitutional principle that would invalidate a federal attempt to prohibit states from legalizing cannabis.
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Federal vs state authority
In the United States, federal law takes precedence over state law, according to the Supremacy Clause, which is part of Article VI of the Constitution. This clause establishes the doctrine of pre-emption, which states that federal law supersedes state law in cases of conflicting legislation.
The Supremacy Clause, introduced as part of the New Jersey Plan during the Federal Convention of 1787, asserts the supremacy of federal law and the priority of federal authority. It dictates that the Constitution, federal laws, and treaties made under the authority of the United States are the "supreme Law of the Land." This means that judges in every state are bound to follow these laws, regardless of any contrary laws or provisions in the state constitution or laws. The core message of the Supremacy Clause is that federal laws take priority over conflicting state laws.
However, it is important to note that the federal government does not always intervene when a state law contradicts federal law. If the contradiction does not impact national security or international relations, the federal government may choose not to enforce the doctrine of pre-emption. For example, prostitution is illegal under U.S. federal law, but some counties in Nevada have legalized it under state law, and the federal government has not taken action to enforce the federal law in this case. Similarly, in 1996, California voters created an exception to the state marijuana possession law for medical use, despite federal law prohibiting possession.
In other cases, the federal government has taken a more active role. For instance, in 2012, voters in Colorado and Washington state legalized marijuana, contradicting federal law. While the Department of Justice initially advised federal prosecutors to focus on specific priorities rather than general marijuana enforcement, this memo was later rescinded, leaving federal policy uncertain. In another example, the federal government sued Arizona to overturn its strict immigration law, citing the Supremacy Clause and arguing that the state law had international implications.
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National security implications
National security is a key area where the contradiction between state and federal laws can have significant implications. In the United States, the federal government holds the power to enforce laws that supersede state legislation, as outlined in the Supremacy Clause of Article VI of the Constitution. This clause ensures that federal laws take precedence over state laws in the event of a conflict. However, the federal government has not consistently intervened in every case of contradiction between state and federal laws, particularly when national security and international relations are not directly impacted.
For instance, in Nevada, certain counties have legalized prostitution, which contradicts federal law. Still, the federal government has not enforced the doctrine of pre-emption in this case, possibly due to its limited resources and the focus on higher-priority cases. Similarly, in 2012, Colorado and Washington state legalized marijuana, despite federal laws prohibiting it. The Drug Enforcement Administration (DEA) has not taken any action in these states, leaving the nation's drug policy in a state of limbo.
In contrast, when state laws contradict federal laws and have international implications or threaten national security, the federal government is more likely to intervene. For example, Arizona passed a strict immigration law that the federal government challenged in court, arguing that it had implications for Mexico and Latin America. The federal government's selective enforcement of the Supremacy Clause highlights the dynamic nature of the relationship between state and federal laws and the potential impact on national security decision-making.
The immigration system in the United States also highlights the national security implications of contradictions between state and federal laws. Fraudulent claims and unethical practices by attorneys and law firms have undermined the integrity of immigration laws and national security. The federal government faces challenges in addressing these issues, as gathering information to refute fraudulent claims is a significant burden.
Additionally, the conduct of lawyers and law firms can have consequences for national security, homeland security, public safety, and election integrity. For example, in 2016, a lawyer was involved in creating a false dossier to influence a presidential election, impacting the Federal law enforcement investigation. These examples demonstrate the complex dynamics between state and federal laws and the potential impact on national security decision-making and enforcement.
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Human trafficking
In the United States, the law that applies when state and federal laws disagree is called the "supremacy clause", which is part of Article VI of the Constitution. The core message of the supremacy clause is that the Constitution and federal laws take priority over any conflicting rules of state law. In other words, if a federal and state law contradict, then when you're in the state, you can follow the state law, but the federal government can decide to stop you.
In the context of human trafficking, modern prohibitions of human trafficking in the United States have their roots in the 13th Amendment to the U.S. Constitution, which barred slavery and involuntary servitude in 1865. Prior to 2000, the Department of Justice (DOJ) filed human trafficking cases under several federal statutes related to involuntary servitude and slavery, but the criminal laws were narrow and patchwork.
The Trafficking Victims Protection Act (TVPA) of 2000 was the first comprehensive federal law to address trafficking in persons. The TVPA provides a three-pronged approach that includes prevention, protection, and prosecution. The TVPA was reauthorized through the Trafficking Victims Protection Reauthorization Act (TVPRA) in 2003, 2005, 2008, 2013, 2017, and 2018. The TVPRA of 2003 refined federal criminal provisions against trafficking, adding human trafficking crimes as a Racketeer Influenced and Corrupt Organizations Act (RICO) predicate, and created a civil remedy enabling trafficking victims to file lawsuits against their traffickers in federal district court. The TVPRA of 2005 provided extraterritorial jurisdiction over trafficking offenses committed overseas by persons employed by or accompanying the federal government, and established grant programs to support victims and combat trafficking.
Other federal laws related to human trafficking include the Preventing Sex Trafficking and Strengthening Families Act of 2014, which seeks to reduce the incidence of sex trafficking among youth involved in the foster care system, and the Justice for Victims of Trafficking Act (JVTA) of 2015, which improves the U.S. response to human trafficking by strengthening services for victims and requiring the creation of a domestic trafficking victim's fund. The Abolish Human Trafficking Act of 2017 and the Trafficking Victims Protection Act of 2017 further demonstrate the federal government's continued efforts to address human trafficking.
While federal law takes precedence over state law in the U.S., it is worth noting that states also play a crucial role in combating human trafficking through their own legislation and enforcement efforts.
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Frequently asked questions
The Supremacy Clause is a provision in Article VI of the US Constitution that outlines the supremacy of federal law over state law in cases of conflict.
In the case of conflicting state and federal laws, the federal law takes precedence. This is based on the Supremacy Clause, which establishes the priority of federal authority.
Yes, in some cases. For example, certain states have legalized marijuana for medical or recreational use, despite it being classified as a Schedule I Drug under federal law. However, the federal government can still enforce its laws and may choose to intervene if it deems necessary.
No, historically the federal government has not intervened in every case of conflicting state and federal laws. For example, in Nevada, prostitution is legal in counties with a population of less than 700,000 people, which contradicts federal law, but the federal government has not enforced its laws in this case.
The federal government may be more likely to intervene if the issue affects national security or international relations. For instance, the federal government sued Arizona to overturn its strict immigration law due to its international implications.

















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