In criminal law, the course of conduct legal definition is a pattern of two or more acts, directed at a specific person, that are connected by a continuity of purpose. It’s the threshold element in nearly every stalking and harassment case: one incident, however alarming, doesn’t meet it, and unrelated incidents don’t either. What prosecutors need is a series of acts that hang together because the same objective runs through them.
The Two-Act Floor Under Federal Law
Federal law sets the baseline definition at 18 U.S.C. § 2266: a course of conduct is “a pattern of conduct composed of two or more acts, evidencing a continuity of purpose.”1Office of the Law Revision Counsel. 18 USC 2266 – Definitions Two is the minimum, not a target. A single event, no matter how frightening, falls outside the definition. The acts also have to be linked; two random and unrelated confrontations don’t add up to a course of conduct just because they involved the same two people.
Most state stalking and harassment statutes track this framework. Some require more than two acts, and some add a time window, but the core idea is uniform across jurisdictions: isolated behavior is not stalking, and patterns are.
What “Continuity of Purpose” Actually Requires
The phrase “continuity of purpose” does real work in court. It forces prosecutors to connect each incident to the others and show that the defendant was driven by a single ongoing objective rather than by unrelated frustrations on different days.
Timing matters, but there’s no universal maximum gap between incidents. Some state statutes require the acts to be “close in time,” and others leave the question to judges. A pattern of weekly texts that stops for six months and then resumes with the same tone and themes will often still qualify, especially when the gap has an explanation like the victim relocating or the defendant being incarcerated. Two unrelated confrontations separated by years, with nothing in between, are much harder to charge as a single course of conduct.
Courts look for connecting threads: the same type of communication, the same demands, the same locations, the same emotional triggers. When those threads run through every incident, the time gaps shrink in importance. Without them, even closely spaced incidents can look like separate disputes rather than a campaign.
Behaviors That Can Form the Pattern
The specific acts that build a course of conduct vary widely, but a few categories come up repeatedly.
- Physical surveillance: repeatedly showing up near someone’s home, workplace, gym, or other places they frequent. One encounter might be coincidence; multiple appearances at different locations over time are not.
- Unwanted communication: persistent phone calls, texts, emails, or social media contact after being told to stop. Volume and frequency matter, but even a handful of messages can qualify if they escalate in tone or content.
- Electronic tracking: installing GPS devices on a car, planting spyware on a phone, or using location-sharing features without consent. At least 26 states and the District of Columbia have laws specifically addressing unauthorized location tracking, and in roughly a dozen of those states the prohibition is built directly into the stalking statute.2National Conference of State Legislatures. Private Use of Location Tracking Devices: State Statutes
- Third-party contact: reaching out to a target’s family, friends, or coworkers to gather information, relay messages, or apply pressure. Courts sometimes call this harassment by proxy, and it counts even though the defendant never contacted the target directly.
- Property damage and threats to animals: vandalizing a car, slashing tires, or threatening a pet or service animal. The federal statute explicitly includes pets, service animals, emotional support animals, and horses as potential targets of threatening conduct.3Office of the Law Revision Counsel. 18 USC 2261A – Stalking
No single act on this list automatically makes a stalking case. The legal question is always whether the individual incidents, taken together, show a pattern directed at the same target with a shared purpose.
The Reasonable Person Test
Courts don’t measure the effect of a course of conduct only by how the actual victim felt. The federal statute asks whether the behavior placed the target in reasonable fear of death or serious bodily injury, or caused (or would reasonably be expected to cause) substantial emotional distress.3Office of the Law Revision Counsel. 18 USC 2261A – Stalking The “would be reasonably expected to cause” language is where the objective check lives. A hypothetical reasonable person in the victim’s position must also find the conduct frightening or seriously distressing.
The standard cuts both ways. It filters out cases where someone is unusually sensitive or where the contact, while unwelcome, wouldn’t alarm most people. It also protects victims who try to minimize what’s happening to them: if a reasonable person would have been afraid, the fact that the actual victim downplayed the danger doesn’t defeat the charge.
Intent Is a Separate Element
Establishing a course of conduct is only half the case. The federal stalking statute also requires proof that the defendant acted with intent to kill, injure, harass, intimidate, or place another person under surveillance with the purpose of causing harm or fear.3Office of the Law Revision Counsel. 18 USC 2261A – Stalking This is a specific intent requirement. Prosecutors cannot simply show that the behavior happened to frighten someone; they have to prove the defendant meant to produce that result or consciously chose to keep going despite knowing the effect.
The Supreme Court raised the bar further in Counterman v. Colorado (2023), holding that the First Amendment requires at least a showing of recklessness before someone can be convicted for threatening statements. Under that standard, the prosecution must prove the defendant was aware that others could view the statements as threatening and delivered them anyway. A person who genuinely didn’t realize their messages were frightening cannot be convicted based only on how a reasonable observer would read the words. Negligence is not enough.
In practice, this makes documented notice central. The strongest cases involve defendants who were warned, told to stop, served with a protection order, or otherwise put on notice that their behavior was unwelcome and continued anyway.
How the Pattern Gets Proven
Because the definition depends on stitching separate acts into a coherent pattern, building a stalking case is fundamentally a documentation exercise. The strongest cases present a clear chronological record that makes the pattern impossible to dismiss as coincidence.
Useful evidence includes screenshots of every text, email, and social media message with timestamps and metadata intact, phone records showing call frequency, GPS or location data, security camera footage, and saved voicemails. Witnesses who observed the defendant appearing at the victim’s home or workplace add weight, and police reports create an official paper trail even when individual incidents didn’t result in an arrest.
Prosecutors often lay this evidence out on a timeline or calendar to show density and escalation. A spreadsheet of 47 text messages over three weeks tells one story; those same messages plotted alongside two workplace appearances and a report of a slashed tire tell a much stronger one. The goal is to let the pattern speak for itself.
Repeated Contact That Isn’t a Course of Conduct
Not all persistent, unwanted contact is criminal. Stalking and harassment statutes have to coexist with the First Amendment, and courts leave space for activities that can feel intrusive but serve a legitimate purpose. Investigative journalism, labor picketing, lawful protest, and political canvassing can all involve repeated contact with someone who would prefer to be left alone. These activities are generally protected unless they cross into true threats or conduct that has no communicative value.
That boundary matters for anyone trying to apply the course of conduct definition to a real situation. Two or more acts, aimed at the same person, tied together by a shared purpose, targeting private conduct rather than expressive activity, and paired with the intent and reasonable-fear elements — that is the full picture the law draws. Anything short of it may still be unwelcome, but it isn’t what the statute is describing.