What are examples of state laws that conflict with federal laws?

Asked by: Miss Marjorie Auer  |  Last update: May 2, 2026
Score: 4.2/5 (17 votes)

State laws conflicting with federal laws often involve areas like marijuana legalization, where state laws permit it but federal law still prohibits it; immigration enforcement, where states pass their own rules; and historical instances like same-sex marriage before federal recognition, all highlighting the Supremacy Clause where federal law generally overrides state law, though enforcement can vary. Examples include states allowing cannabis sales against the federal Controlled Substances Act, state attempts to regulate immigration, and historical disputes over tariffs (Nullification Crisis) and banking (Ohio vs. Bank of the U.S.).

What is an example of a conflict between state and federal law?

There have been many times when state and federal laws have disagreed. Today, you can still see this happening with some very important issues. Same-sex marriage and marijuana use are two examples of laws that are different between states and the federal government.

How do state laws interact with federal laws?

The Constitution's Supremacy Clause provides that federal law is "the supreme Law of the Land" notwithstanding any state law to the contrary. This language is the foundation for the doctrine of federal preemption, according to which federal law supersedes conflicting state laws.

Can a state pass a law that conflicts with federal law?

The Supremacy Clause of the Constitution of the United States (Article VI, Clause 2) establishes that the Constitution, federal laws made pursuant to it, and treaties made under the authority of the United States, constitute the "supreme Law of the Land", and thus take priority over any conflicting state laws.

How are conflicts between federal and state laws settled?

Conflicts between the laws are resolved by the Supremacy Clause of the U.S. Constitution, Article VI, which says that laws enacted in furtherance of the U.S. Constitution are the "supreme law of the land," and that federal laws have superiority over the state constitutions and laws.

What Happens When State Laws Conflict with Federal Law?

39 related questions found

What is a conflict of laws between states?

A true conflict occurs when one state offers a protection to a particular party that another state does not, and the court of the state that offers no such protection is asked to apply the law of the state offering the protection.

What are state issues vs federal issues?

Overview. There are different types of laws. Federal laws apply to everyone in the United States. State and local laws apply to people who live or work in a particular state, commonwealth, territory, county, city, municipality, town, township or village.

What happens if a state law contradicts a federal law?

When a state law conflicts with federal law, the federal law prevails due to the U.S. Constitution's Supremacy Clause, a principle known as preemption, meaning the federal government has the final say in areas where it has constitutional authority, overriding conflicting state statutes, regulations, or even state court decisions. This ensures a uniform national standard in many areas, though Congress can sometimes allow states to set stricter rules, as seen with marijuana laws or some medical device regulations. 

When there is a conflict between a state and a federal law, which is considered the supreme law of the land?

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 ...

Can states make laws that violate federal law?

It is settled that states cannot nullify federal laws—though constitutional amendments giving them such power have been proposed. In other areas of law, though, the struggle persists.

Can state laws be more restrictive than federal laws?

Environmental conservation laws, employee minimum wage laws and banking regulations are examples of situations where some state laws are more restrictive than similar federal laws.

Can something be federally legal but illegal in a state?

The supremacy cause contains what's known as the doctrine of pre-emption, which says that the federal government wins in the case of conflicting legislation. Basically, if a federal and state law contradict, then when you're in the state you can follow the state law, but the fed can decide to stop you.

Can a state enforce federal law?

Many federal statutes authorize civil enforcement by both a federal agency and the states, typically through their attorneys general. State enforcement is largely decentralized, and states act on behalf of a set of interests that diverge significantly from those represented by federal enforcers.

When there is a conflict between state law and federal law and the federal government has authority over the issue who's law wins?

The Supremacy Clause of the U.S. Constitution

Under the Supremacy Clause, found in Article VI, section 2 of the U.S. Constitution, both the Constitution and federal law supersede state laws. Article I, section 8 of the Constitution defines the powers of the U.S. Congress.

What happens if a state does not comply with federal law?

Thus, the federal courts have held that under the Constitution, federal law is controlling over state law, and the final power to determine whether federal laws are unconstitutional has been delegated to the federal courts. The courts therefore have held that the states do not have the power to nullify federal law.

What is an example of a conflict of law?

This can occur when both state and federal laws are relevant, or when laws from multiple states conflict. For example, if a person passes away and their estate includes property in several states, or if a business operates across state lines, questions about which laws to follow may arise.

What happens when there is a conflict between state, local, and federal law?

The preemption doctrine comes from the supremacy clause. It states that federal law preempts state law when the laws conflict. Federal law also preempts state or local law if Congress intends to regulate an area and exclude the states.

When a state law conflicts with a federal law, which of the following occurs?

When a state law conflicts with federal law, the federal law prevails due to the U.S. Constitution's Supremacy Clause, a principle known as preemption, meaning the federal government has the final say in areas where it has constitutional authority, overriding conflicting state statutes, regulations, or even state court decisions. This ensures a uniform national standard in many areas, though Congress can sometimes allow states to set stricter rules, as seen with marijuana laws or some medical device regulations. 

What is a conflict of law between states?

Definitions (Conflict/Choice of Law)

Conflict of laws: "1. A difference between the laws of different states or countries in a case in which a transaction or occurrence central to the case has a connection to two or more jurisdictions. – Often shortened to conflict.

When a state law is in direct conflict with federal law, the _____ prevails.?

Under the Constitution's Supremacy Clause, federal law is the “supreme Law of the Land” and overrides conflicting state law.

When there is a conflict between federal and state law, federal law prevails because of the Supremacy Clause, true or false?

The Supremacy Clause ensures federal law prevails over state law when conflicts arise. It applies to the Constitution, federal statutes, and treaties. State laws that conflict with federal laws are considered void.

What is the invalidation of a US state law that conflicts with federal law called?

In the law of the United States, federal preemption is the invalidation of a U.S. state law that conflicts with federal law.

Which law would you follow if state and federal laws differ?

The Supremacy Clause refers to the foundational principle that, in general, federal law takes precedence over any conflicting state law.

How is there conflict between state and federal law?

When state law and federal law conflict, federal law displaces, or preempts, state law, due to the Supremacy Clause of the Constitution.

Is education a state or federal issue?

Education is primarily a State and local responsibility in the United States. It is States and communities, as well as public and private organizations of all kinds, that establish schools and colleges, develop curricula, and determine requirements for enrollment and graduation.