TLDR
Substantive due process is the idea that the government cannot take away certain fundamental rights, even when it follows fair procedures. The Supreme Court has used this idea, rooted in the Fourteenth Amendment's due process clause, to recognize an unenumerated right to privacy.

Due Process Clause and the Right to Privacy in AP Gov
For AP Gov 3.9, the key idea is that substantive due process limits the government from arbitrarily infringing on fundamental individual rights. The right to privacy is an unenumerated right, meaning it is not explicitly listed in the Constitution, but the Supreme Court has connected it to the due process clause of the Fourteenth Amendment.
Griswold v. Connecticut recognized privacy from government infringement, Roe v. Wade extended privacy reasoning to abortion, and Dobbs v. Jackson Women's Health Organization overturned Roe and left abortion regulation to legislatures. These cases show that the scope of privacy and substantive due process is still debated.
Why This Matters for the AP Gov Exam
This topic is about how the Court protects rights that are not actually written in the Constitution. That makes it a strong test of whether you understand judicial interpretation, the Fourteenth Amendment, and the difference between procedural and substantive due process.
On the exam, this content shows up in a few ways. Multiple-choice questions may ask you to identify substantive due process or explain how the Court found a right to privacy. In the Argument Essay (FRQ 4), debates over how far judges should go in protecting unenumerated rights connect to ideas about constitutionalism and the balance between federal and state power. Even though the privacy cases here are illustrative and not required, knowing them helps you reason about judicial interpretation across the whole course.
Key Takeaways
- Substantive due process asks whether the government has a strong enough reason to limit a fundamental right, even if it used fair procedures.
- Procedural due process is different: it focuses on whether the government followed fair steps before restricting life, liberty, or property.
- The right to privacy is unenumerated, meaning it is not directly written in the Constitution but has been read into the Fourteenth Amendment's due process clause.
- The Ninth Amendment is often cited as support for the idea that people hold rights beyond those specifically listed.
- Griswold, Roe, and Dobbs trace how the privacy right was first recognized, extended to abortion, and then narrowed when Dobbs returned abortion regulation to state legislatures.
- These privacy cases are useful examples for reasoning, but they are not on the AP required Supreme Court case list.
Procedural vs. Substantive Due Process
The Fifth and Fourteenth Amendments both say the government cannot take your life, liberty, or property without due process of law. The due process clause in the Fifth Amendment limits the national government, and the one in the Fourteenth Amendment limits the states. Courts have read "due process" in two ways.
Procedural Due Process
Procedural due process is about the steps the government must follow before it restricts your rights. It makes sure the process is fair and not arbitrary. Examples include:
- Notice of the charges against you
- A fair hearing
- An impartial decision-maker
This is the focus of Topic 3.8 (rights of the accused), so it is mostly context here.
Substantive Due Process
Substantive due process is the focus of this topic. It asks a different question: does the government have a valid, strong enough reason to limit a fundamental right in the first place? Even when the procedures are fair, the Court can strike down a law if it arbitrarily infringes on a deeply important right.
This is the doctrine the Court has used to recognize rights that are not spelled out in the text, including the right to privacy.
Unenumerated Rights and the Right to Privacy
Over time, the Court has recognized constitutionally protected rights that are not explicitly listed in the Bill of Rights. These are called unenumerated rights, and the right to privacy is the main example for this topic.
Justices and scholars defend unenumerated rights in a few ways:
- Some argue that certain amendments assume these rights exist, even without naming them.
- Others point to the Ninth Amendment, which says that listing some rights in the Constitution does not mean people do not have others.
Using substantive due process, the Court examines whether a law is an arbitrary intrusion on individual rights. If it is, the Court can strike it down even though the word "privacy" never appears in the Constitution.
How the Privacy Cases Trace the Debate
The following cases are illustrative examples for this topic, not required AP Gov Supreme Court cases. You do not need to memorize them as required cases, but they are the clearest way to see how substantive due process and privacy have changed over time.
Griswold v. Connecticut (1965)
A Connecticut law banned the use of contraceptives, even by married couples. The Court read the due process clause to protect a right of privacy and struck the law down. This was the first case to clearly recognize the right to privacy as a constitutional principle, creating a foundation for later privacy decisions.
Roe v. Wade (1973)
In Roe, the Court applied substantive due process to extend the privacy right to a decision to have an abortion. The Court said the government could regulate abortion but could not ban it outright at every stage of pregnancy.
Dobbs v. Jackson Women's Health Organization (2022)
Dobbs overturned Roe. The Court held that the Constitution does not confer a right to abortion and returned the authority to regulate abortion to legislatures. This shift is a major reason the actions protected by privacy and substantive due process are still debated.
Substantive Due Process and Federalism
Substantive due process sits right on the line between individual rights and state power. When the Court uses it to protect a right like privacy, it can limit how far states go in passing their own laws.
- Supporters argue substantive due process protects individual liberty from government overreach.
- Critics argue it lets unelected judges override decisions made by elected state legislatures.
Dobbs is a clear example of this tension. By overturning Roe, the Court said that abortion regulation belongs to state legislatures rather than being settled by a federal constitutional privacy right. This is an application of the federalism debate, not a required case you must cite.
How to Use This on the AP Gov Exam
These are the most relevant ways this topic appears, not every possible question type.
MCQ
Expect questions that ask you to identify substantive due process, distinguish it from procedural due process, or explain how the Court found an unenumerated right to privacy. A stimulus might describe a law and ask which constitutional idea is at stake.
FRQ 4: Argument Essay
The bigger payoff is in argument writing. Debates over unenumerated rights connect to constitutionalism and to how much power judges should have versus elected legislatures. You can use the privacy cases as evidence or examples when arguing about judicial interpretation, federalism, or the balance between liberty and majority rule. Just remember to support your claim by explaining why the evidence matters, not by summarizing the case.
Common Trap
A common trap is treating the privacy cases as required Supreme Court cases. They are illustrative examples here. Use them to reason and explain, but do not assume the exam will give you a question that requires citing Griswold, Roe, or Dobbs by name.
Common Misconceptions
- "Privacy is written in the Constitution." It is not. The right to privacy is unenumerated and was read into the Fourteenth Amendment's due process clause through interpretation.
- "Procedural and substantive due process are the same thing." Procedural due process is about fair steps; substantive due process is about whether the government can limit a fundamental right at all.
- "Dobbs banned abortion nationwide." It did not. Dobbs held there is no constitutional right to abortion and left regulation to state legislatures, so the rules now vary by state.
- "Roe is still a required case, so I should focus on it." Roe, Griswold, and Dobbs are illustrative examples for this topic, not required AP cases.
- "The Ninth Amendment grants specific rights." It does not create a list of rights. It signals that people may hold rights beyond those the Constitution names, which supports the idea of unenumerated rights.
Related AP Gov Guides
Vocabulary
The following words are mentioned explicitly in the College Board Course and Exam Description for this topic.Term | Definition |
|---|---|
Board of Education of Independent School District No. 92 of Pottawatomie County v. Earls | A 2008 Supreme Court case illustrating the scope and limitations of substantive due process and privacy rights. |
Dobbs v. Jackson Women's Health Organization | A 2022 Supreme Court case that overturned Roe v. Wade and held that the Constitution does not confer a right to abortion. |
Due Process Clause | Constitutional provision in the Fifth and Fourteenth Amendments prohibiting the government from infringing on a person's life, liberty, or property without due process of law. |
Griswold v. Connecticut | A 1965 Supreme Court case that established the constitutional right to privacy through substantive due process interpretation of the due process clause. |
Ninth Amendment | The constitutional amendment stating that individuals retain rights beyond those explicitly listed in the first eight amendments. |
Pierce v. Society of Sisters | A 1925 Supreme Court case illustrating the application of substantive due process and privacy rights. |
right to privacy | A constitutionally protected right, recognized through substantive due process, that shields individuals from government intrusion into personal decisions and intimate matters. |
Roe v. Wade | A 1973 Supreme Court case that extended the right to privacy to abortion through substantive due process. |
substantive due process | A constitutional principle that protects individuals from arbitrary government actions that infringe upon fundamental rights, even when proper legal procedures are followed. |
unenumerated rights | Constitutional rights that are not explicitly listed in the Bill of Rights but are recognized by the Supreme Court as protected by the Constitution. |
Frequently Asked Questions
What is substantive due process in AP Gov?
Substantive due process is the idea that the government cannot arbitrarily infringe on certain fundamental rights, even if it follows fair procedures. It focuses on whether the government's action is allowed in the first place.
What is the difference between procedural and substantive due process?
Procedural due process is about fair steps, such as notice and a hearing. Substantive due process is about whether the government has a strong enough reason to limit a fundamental right at all.
What is the right to privacy in AP Gov?
The right to privacy is an unenumerated right that the Supreme Court has read into constitutional protections, especially through the Fourteenth Amendment's due process clause.
What does the Ninth Amendment have to do with privacy?
The Ninth Amendment supports the idea that people may have rights beyond those specifically listed in the Constitution. It is often used as part of the argument for unenumerated rights.
How did Dobbs change the right to privacy debate?
Dobbs overturned Roe and held that the Constitution does not confer a right to abortion. That returned abortion regulation to legislatures and showed that the scope of substantive due process remains contested.
Are Griswold, Roe, and Dobbs required AP Gov cases?
They are important examples for Topic 3.9 because they show how privacy and substantive due process have developed. Use them to reason about judicial interpretation, but always follow the specific case list and prompt you are given.