Con Law for 1Ls: Mahanoy Area School District v. B.L. Explained

If Tinker, Fraser, Hazelwood, and Morse are the classic student-speech cases, Mahanoy Area School District v. B.L. brings that doctrine into the social media age.

The basic lesson is this:

Schools may sometimes regulate off-campus student speech, but their authority is weaker when the speech happens outside school and outside school activities.

That is why Mahanoy Area School District v. B.L., 141 S. Ct. 2038 (2021) is one of the most important modern student-speech cases every 1L should know.

This post is part of a Con Law for 1Ls series, so the goal is to make the case clear enough for class, cold calls, outlines, and exams.

The One-Sentence Takeaway

Mahanoy held that a public school violated the First Amendment by punishing a student for an off-campus Snapchat post criticizing the school and cheerleading team, where the speech caused no substantial disruption.

That is the short version to remember.

Why Your Professor Cares About Mahanoy

Your professor is not assigning Mahanoy just because it involves Snapchat and cheerleading drama. The real reason is that the case asks a major modern First Amendment question:

How far does school authority extend when student speech happens off campus, online, and outside school hours?

That question matters because student speech today often happens:

• on phones,

• on social media,

• at home,

• after school,

• but still reaches classmates and school communities almost instantly.

Mahanoy is the Supreme Court’s first major attempt to address that problem.

The Facts You Actually Need to Know

Here is the short 1L version.

B.L. was a public high school student in Pennsylvania. She tried out for the varsity cheerleading team but did not make it. She was placed on junior varsity instead.

Frustrated, she went to a local convenience store on the weekend and posted two Snapchat images.

One showed B.L. and a friend raising their middle fingers, with the caption:

“Fuck school fuck softball fuck cheer fuck everything.”

The second complained that another student made varsity without spending a year on junior varsity.

The posts were visible to her Snapchat friends for 24 hours. Some of those friends were students and cheerleaders. Screenshots circulated, and the cheerleading coaches eventually saw them.

The school suspended B.L. from the cheerleading team for one year.

B.L. sued, claiming the discipline violated the First Amendment.

The Supreme Court agreed.

The Big Question

The main issue was:

Can a public school punish a student for vulgar off-campus social media speech criticizing the school and an extracurricular activity?

The Supreme Court said not on these facts.

The Holding

Here is the clean holding:

The school violated the First Amendment because B.L.’s off-campus Snapchat speech caused no substantial disruption and the school’s regulatory interests were weakened outside the school environment. See Mahanoy.

That is the core result.

Did the Court Say Schools Can Never Regulate Off-Campus Speech?

No.

This is one of the most important points.

The Court rejected the Third Circuit’s broad rule that Tinker never applies off campus.

Instead, the Court said schools may have authority over some off-campus speech, including speech involving:

• serious bullying or harassment,

• threats aimed at students or teachers,

• cheating or rule violations in online school activities,

• breaches of school security,

• remote learning,

• school email,

• and some extracurricular activities.

See Mahanoy.

So the rule is not “schools have no power off campus.”

The rule is more nuanced:

Schools may have some authority off campus, but that authority is diminished.

Why the School Lost

The school lost because several factors cut strongly in B.L.’s favor.

1. The speech happened off campus

B.L. posted from a convenience store, outside school hours, using her own phone.

That mattered because schools do not stand in the same relationship to students off campus as they do during school.

2. The speech was personal expression

The post was crude, but it expressed frustration and criticism. It was not a true threat, fighting words, or harassment.

3. There was no substantial disruption

The school showed that some students were upset and that the posts were discussed briefly in class. But that was not enough.

Under Tinker, schools need more than discomfort or minor distraction.

4. The school’s anti-vulgarity interest was weaker off campus

Schools can regulate vulgar speech more easily in school. But B.L. was not in school, not at a school event, and not speaking under school supervision.

See Mahanoy.

The Three Features of Off-Campus Speech

The Court identified three features of off-campus speech that usually reduce school authority.

1. Schools rarely act in loco parentis off campus

“In loco parentis” means the school acts in the place of parents.

On campus, schools often supervise students in place of parents. Off campus, parents usually have primary authority.

2. Regulating off-campus speech risks covering a student’s entire life

If schools can regulate both on-campus and off-campus speech, then they may effectively control a student’s speech 24 hours a day.

That raises serious First Amendment concerns.

3. Schools have an interest in protecting unpopular speech

The Court emphasized that public schools are “nurseries of democracy.” They have an interest not only in order, but also in teaching students that unpopular expression is protected.

This is one of the most important ideas in the opinion.

The Key Rule in 1L Terms

Here is the exam-friendly rule statement:

Schools may sometimes regulate off-campus student speech, but their authority is diminished off campus, and discipline is unconstitutional where the speech is protected expression that causes no substantial disruption or invasion of others’ rights.

That is the clean Mahanoy rule.

How Mahanoy Applies Tinker

Mahanoy does not overrule Tinker.

Instead, it applies Tinker in a more cautious way to off-campus speech.

The Court said B.L.’s speech did not cause the kind of material and substantial disruption required by Tinker.

A few students being upset and a brief classroom discussion did not meet that standard.

So Mahanoy reinforces that Tinker still matters, but off-campus context changes the strength of the school’s interests.

What About Profanity?

This is a common exam trap.

The school argued that it had an interest in teaching good manners and prohibiting vulgar speech.

The Court acknowledged that interest but said it was weaker here because B.L. spoke off campus, on her own time, using her own phone.

That distinguishes the case from Bethel v. Fraser, where the student gave a lewd speech at a school assembly.

So:

• vulgar speech at school assembly = Fraser

• vulgar off-campus Snapchat criticizing school = Mahanoy

That distinction matters.

The Cold-Call Version

If your professor asks, “What is Mahanoy v. B.L. about?” you can say:

Mahanoy held that schools may sometimes regulate off-campus student speech, but their authority is diminished off campus. The school violated the First Amendment by punishing a student for a vulgar Snapchat post criticizing cheerleading because the post caused no substantial disruption and occurred outside school supervision.

That is a strong cold-call answer.

Justice Alito’s Concurrence

Justice Alito, joined by Justice Gorsuch, concurred and emphasized that the Court’s decision should not be misunderstood.

He explained that schools may regulate some off-campus speech, especially when tied to school programs or threats, harassment, or online learning.

But he stressed that parents do not give schools total authority over students’ speech simply by enrolling them in public school.

For 1Ls, the concurrence is useful because it gives a framework for thinking about off-campus speech and parental authority.

Justice Thomas’s Dissent

Justice Thomas dissented.

He argued that historically, schools had broader authority to discipline students for off-campus speech that had a direct tendency to harm the school environment.

He thought the school could discipline B.L. for speech that undermined the cheerleading program.

The dissent is important because it shows a very different approach: history and school authority rather than the majority’s more speech-protective balancing.

Common 1L Mistakes About Mahanoy

Mistake #1: Saying schools can never regulate off-campus speech

Wrong. The Court rejected that broad rule.

Mistake #2: Saying Tinker does not apply off campus

Also too broad. The Court declined to adopt that categorical approach.

Mistake #3: Ignoring the lack of substantial disruption

This was key to B.L.’s win.

Mistake #4: Treating Mahanoy like Fraser

Franchise involved speech at a school assembly. Mahanoy involved off-campus speech on personal social media.

Mistake #5: Forgetting the school’s authority is diminished, not eliminated

That is the nuance.

Quick IRAC for Your Outline

Issue

Can a public school punish a student for vulgar off-campus Snapchat posts criticizing the school and cheerleading team?

Rule

Schools may sometimes regulate off-campus speech, but their authority is diminished outside school supervision. Under Tinker, schools need a showing of substantial disruption or invasion of others’ rights to justify discipline for protected expression. See Mahanoy.

Application

B.L. posted from a convenience store, outside school hours, on her own phone, to her private Snapchat friends. The posts were vulgar but did not constitute threats, harassment, or fighting words. The school showed only minor disruption and upset feelings, not substantial disruption.

Conclusion

The discipline violated the First Amendment.

What to Put in Your Case Brief

If you are briefing Mahanoy for class, include:

• Facts: student posted vulgar Snapchat criticizing school and cheerleading after failing to make varsity

• Issue: can school discipline off-campus social media speech?

• Holding: not here

• Reasoning: school authority is diminished off campus; no substantial disruption; speech was protected

• Key doctrine: off-campus student speech

• Connection to Tinker: substantial disruption still matters

• Connection to Fraser: school’s power over vulgar speech is weaker off campus

That is enough for most 1L purposes.

Why Mahanoy Still Matters Today

Mahanoy is crucial because student speech increasingly happens online.

It matters in cases involving:

• Snapchat,

• Instagram,

• TikTok,

• group chats,

• off-campus profanity,

• extracurricular discipline,

• bullying,

• threats,

• harassment,

• and online speech that reaches school.

The case does not answer every social media question, but it gives courts a framework: schools may have some authority, but off-campus speech receives stronger First Amendment protection.

How Mahanoy Fits with the Student-Speech Cases

Here is the student-speech sequence:

• Tinker: schools need substantial disruption to restrict personal political speech.

• Fraser: schools can restrict lewd or vulgar speech at school.

• Hazelwood: schools can control school-sponsored speech for legitimate pedagogical concerns.

• Morse: schools can restrict speech promoting illegal drug use at school-supervised events.

• Mahanoy: schools have diminished authority over off-campus student speech, especially when there is no substantial disruption.

That is the modern student-speech framework.

Final Takeaway for 1Ls

If you remember nothing else, remember this:

Mahanoy Area School District v. B.L. says schools may sometimes regulate off-campus student speech, but their power is weaker off campus, and they cannot punish protected student criticism without a strong school-related justification.

That is why the case matters.

The Snapchat post was the vehicle.The real subject was how the First Amendment applies to student speech in the social media age.

And that is why Mahanoy Area School District v. B.L., 141 S. Ct. 2038 (2021) is one of the core Con Law cases every 1L should know.