In harassment and stalking law, a course of conduct with no legitimate purpose is a two-part test: a series of acts directed at a specific person showing a continuity of purpose, combined with the absence of any lawful, valid reason for the behavior. Federal law uses this framing, and most state harassment and stalking statutes borrow it with minor variations.1Legal Information Institute. 18 USC 1514 – Civil Action to Restrain Harassment of a Victim or Witness – Definitions Both halves have to be present. A pattern of contact with a valid reason behind it is not harassment, and a single rude act, without more, usually is not either. Understanding each piece on its own is how courts decide whether a particular situation crosses the legal line.
What “Course of Conduct” Means
A course of conduct is a series of acts over a period of time, however short, that together show a continuity of purpose. The word “series” is doing the work. One unwanted phone call or a single rude comment rarely qualifies. Courts are looking for a pattern where the individual acts connect to each other and reveal an ongoing intent rather than random, unrelated contact.
The acts do not have to be identical. Calling someone repeatedly over several days fits. So does showing up uninvited at the same person’s home on multiple occasions, or sending a stream of unwanted messages. A mix of behaviors — following someone, leaving items at their door, and sending threatening texts — can also form a single course of conduct when they share a purpose and target the same person.1Legal Information Institute. 18 USC 1514 – Civil Action to Restrain Harassment of a Victim or Witness – Definitions
There is no fixed number of incidents. Two acts can be enough when the connection between them is clear. Courts weigh frequency, proximity in time, and similarity. Three targeted incidents in a single week may be stronger than a dozen scattered events across three years with no apparent link.
When a Single Act Can Qualify
There is an exception to the pattern requirement. Federal law defines harassment as either a course of conduct or a single “serious act” directed at a specific person that causes substantial emotional distress and serves no legitimate purpose.1Legal Information Institute. 18 USC 1514 – Civil Action to Restrain Harassment of a Victim or Witness – Definitions A serious act is a single instance of threatening, retaliatory, or violent conduct severe enough that it could reasonably influence a victim or witness in a federal criminal case. Most harassment claims still rest on a pattern, but one extreme incident can be enough on its own.
What “No Legitimate Purpose” Means
The second half of the test asks why. Behavior serves no legitimate purpose when it has no valid, lawful, or justifiable reason and exists solely to alarm, annoy, or cause substantial emotional distress.1Legal Information Institute. 18 USC 1514 – Civil Action to Restrain Harassment of a Victim or Witness – Definitions This element is what separates actionable harassment from behavior that is annoying but legally protected.
The idea is easier to see through examples of what does have a legitimate purpose. A landlord knocking repeatedly to deliver a lawful eviction notice is engaging in unwanted contact, but the purpose is carrying out a legal obligation. A debt collector calling within the bounds of federal consumer protection law is doing something the debtor finds distressing, yet the calls have a recognized legal basis. A process server returning several times to deliver court papers is performing a function the legal system requires.
Compare those with someone who calls an ex-partner dozens of times a day after being told to stop, or a former coworker who repeatedly drives past someone’s house and photographs them through the windows. No legal right or professional duty justifies that conduct. The behavior exists to intimidate, and that absence of any lawful reason is exactly what the phrase captures.
Where Free Speech Fits In
Harassment laws run into the First Amendment, and the tension matters. Not every form of repeated contact is unlawful. Picketing on a public sidewalk, publishing critical opinions online, and contacting a public official to complain all involve repetitive conduct directed at specific people, but they are protected because they serve a legitimate communicative purpose.
The line shifts when speech becomes a true threat. In Counterman v. Colorado (2023), the U.S. Supreme Court held that to convict someone of making a true threat, the government must prove the speaker acted at least recklessly, meaning the speaker consciously disregarded a substantial risk that the statements would be viewed as threatening violence.2Supreme Court of the United States. Counterman v. Colorado, 600 U.S. 66 (2023) An objective test asking only how a reasonable listener would read the words is not enough.
The ruling raised the bar for criminal harassment cases built on speech alone. Prosecutors need evidence that the defendant knew, or consciously ignored the risk, that the words would be perceived as threats. Conduct-based harassment, such as physically following someone, is not affected because it is not speech. For cases built entirely on messages, emails, or posts, this distinction is often where the case turns.
Common Examples of Qualifying Conduct
Certain categories appear in harassment and stalking cases over and over. Persistent unwanted communication is the most common: repeated calls, text floods, emails after a no-contact request, and social media messages. These also happen to be the easiest to document, which is part of why they feature so heavily in court filings.
Physical surveillance and following make up another familiar category. Showing up repeatedly at someone’s workplace, trailing them in a car, or waiting outside their home all demonstrate the kind of directed behavior courts look for. Leaving unwanted items, gifts, or notes at a person’s door or car can serve the same function, signaling that the person is being watched.
Online conduct raises its own questions. Monitoring someone’s social media, creating fake accounts to contact them after being blocked, posting their personal information publicly, and using tracking software all fall under what many jurisdictions treat as cyberstalking. The technology changes, but the legal question is the same: is there a pattern of targeted behavior with no legitimate reason behind it?
How Courts Evaluate These Claims
Proving a course of conduct with no legitimate purpose requires more than telling a judge that someone will not leave you alone. Courts need evidence of the pattern and evidence that nothing lawful justified it. Documentation is what separates claims that succeed from those that do not. The most persuasive forms include:
- A contemporaneous log recording the date, time, location, and a description of each incident as it happens. A diary written in real time carries far more weight than a summary pulled from memory weeks later.
- Digital records of text messages, emails, voicemails, and social media messages. Screenshots are safer than relying on the originals, since the sender can delete them.
- Photos and video. Doorbell camera captures and security footage directly corroborate the log when the person appears at your home or workplace.
- Witness statements from friends, neighbors, or coworkers who observed the behavior.
- Police reports filed after each incident, which create an official paper trail even when law enforcement takes no immediate action.
The log is where most people fall short. Writing down every incident feels tedious when you are stressed and frightened, but courts rely on specifics. “He called me a bunch of times” is vague. “He called at 9:14 p.m. on March 3, left a two-minute voicemail, and I saved it” is evidence.
A Note on Workplace Harassment
Workplace harassment under federal employment law uses a different framework. The Equal Employment Opportunity Commission defines unlawful workplace harassment as unwelcome conduct based on a protected characteristic, such as race, sex, religion, or disability, that is severe or pervasive enough to create a hostile work environment.3U.S. Equal Employment Opportunity Commission. Harassment That standard does not use the course-of-conduct test. The two frameworks overlap in concept but operate under different statutes, so a situation that falls short of criminal harassment can still violate employment law, and the reverse is also true.