Interference with an emergency request for assistance is the crime of deliberately preventing someone from reaching 911 or disrupting the systems that make emergency calls possible. It covers grabbing or destroying a phone during a fight, jamming radio signals used by police and paramedics, cutting phone lines, and calling dispatchers back with false “all clear” messages. Nearly every state treats this conduct as a specific offense, usually a misdemeanor, and several federal statutes apply when the interference reaches communications infrastructure or involves false emergency reports.
What the Offense Actually Covers
Two kinds of conduct fall under this heading. The first is blocking a specific person’s call for help. The second is disrupting the emergency communication system itself.
Blocking a call is the version most people are charged with. It includes snatching or smashing a phone, ripping a landline from the wall, hiding a cell phone, and physically restraining someone so they can’t reach a device. It also reaches less obvious conduct: disabling a home security system that would otherwise alert authorities, or calling 911 back after someone else has dialed and telling the dispatcher the situation is resolved.
You don’t have to succeed in stopping the call. In most jurisdictions, the attempt is enough. If you grab a phone out of someone’s hand and they run next door and call from there, you can still be charged.
The second category targets the infrastructure. Federal law prohibits willfully or maliciously interfering with authorized radio communications, including the frequencies used by police, fire departments, and EMS.1Office of the Law Revision Counsel. 47 USC 333 – Willful or Malicious Interference Signal jammers are the clearest example. The FCC has warned that jammers can block 911 calls, and anyone who operates, markets, or sells them faces fines, equipment seizure, and criminal prosecution.2Federal Communications Commission. Jammer Enforcement Cutting telephone lines, disabling a building’s phone system, and sabotaging cell towers fall under the same umbrella.
Why It Comes Up in Domestic Violence Cases
Most of these charges are filed in domestic violence situations. The pattern is familiar to officers responding to these calls: during or after an assault, the aggressor takes or breaks the victim’s phone, blocks the doorway so the victim can’t reach a neighbor, or threatens more violence if the victim calls police.
Legislatures have responded with statutes aimed squarely at this conduct. Some states make it a standalone misdemeanor to prevent a domestic violence victim from calling for help. Others fold it into the domestic violence statute as an aggravating factor that increases the penalty for the underlying assault or battery. Either way, the charge usually stacks on top of the other offenses from the same incident, so the defendant faces multiple counts rather than one consolidated charge.
A conviction for this kind of interference often triggers eligibility for a protective order. The court can bar the defendant from contacting the victim, approaching the home or workplace, or possessing firearms. Violating the order is itself a separate crime.
When Federal Law Applies
Most prosecutions happen in state court. Federal law enters the picture when the conduct hits certain thresholds.
Jamming and Communications Interference
Under the Communications Act, willfully interfering with licensed radio communications is a federal crime, and the FCC’s Enforcement Bureau treats complaints involving public safety communications as a priority.3Federal Communications Commission. Interference Resolution A first offense carries a fine of up to $10,000, up to one year in prison, or both. A second conviction doubles the maximum prison term to two years.4Office of the Law Revision Counsel. 47 USC 501 – General Penalty
False Reports and Swatting
Federal law also reaches people who feed false information into the emergency system. Conveying false or misleading information about dangerous activities like bombings, hijackings, or attacks involving weapons of mass destruction is punishable by up to five years in federal prison. If someone suffers serious bodily injury because of the hoax, the maximum rises to 20 years. If someone dies, the sentence can reach life.5Office of the Law Revision Counsel. 18 USC 1038 – False Information and Hoaxes
This statute matters for swatting, where someone calls in a fake emergency to trigger an armed police response at a victim’s address. There’s no standalone federal anti-swatting law yet, but prosecutors have used the hoax statute along with laws covering interstate threats and cyberstalking to bring federal charges. Proposed legislation would create a dedicated swatting offense with penalties up to 20 years when someone is seriously injured.
Kari’s Law
A quieter form of interference is a phone system that forces callers to dial a prefix before reaching an outside line. In 2018, Congress passed Kari’s Law, named for a woman killed in a hotel while her daughter tried unsuccessfully to dial 911 from the room phone. The law requires multi-line telephone systems in hotels, offices, and similar buildings to allow direct 911 dialing without any prefix or access code.6Office of the Law Revision Counsel. 47 USC 623 – Configuration of Multi-Line Telephone Systems for Direct Dialing of 9-1-1 Manufacturers, sellers, installers, and managers of these systems must comply.7Federal Communications Commission. Multi-Line Telephone Systems – Kari’s Law and RAY BAUM’s Act
Penalties
State penalties vary, but the framework is consistent. A first offense is usually a misdemeanor. Aggravating circumstances push the charge to a felony.
A misdemeanor conviction for blocking an emergency call generally carries up to one year in jail and a fine that varies by state. Probation is common for first-time offenders, often paired with community service, anger management, or a domestic violence intervention program. Judges may impose some combination of these or use probation in place of jail.
The charge becomes a felony when the interference leads to serious consequences. If someone is badly hurt or killed because responders couldn’t be reached in time, the defendant faces substantially harsher punishment. Repeat offenses trigger felony treatment in many states, and so does interference committed while violating a protective order. Felony convictions carry multi-year prison sentences and larger fines.
Restitution is also on the table. Under federal law, a defendant convicted of conveying false emergency information must reimburse any state, local, or private nonprofit organization that provides fire or rescue services for the costs of responding to the hoax.5Office of the Law Revision Counsel. 18 USC 1038 – False Information and Hoaxes Many states have parallel provisions. These amounts aren’t capped; they reflect the actual cost of the response, including responder overtime and equipment use.
Defenses
Defendants charged with this offense do have options, though each one depends on the facts.
The most common defense is lack of intent. These statutes require that the defendant knowingly or intentionally blocked the call. Accidentally knocking a phone off a table during an argument is different from grabbing it and throwing it. Prosecutors look at the full context, though, and an “accident” that happens right after a physical confrontation is a hard sell.
A second defense disputes that an emergency actually existed. If the person dialing 911 wasn’t in genuine danger, the defendant can argue there was no emergency request to interfere with. This argument is risky. Courts define “emergency” broadly, and asking a jury to second-guess whether someone’s fear was justified rarely works.
Technical challenges come up when the prosecution’s case rests on showing a phone was disabled or a call was blocked. The defense may present evidence that the device malfunctioned on its own or that the call failed for reasons unrelated to the defendant. These arguments usually require expert testimony about how the device or network operates.
Consequences Beyond the Sentence
The jail time and fine are only part of what a conviction costs.
Employment is the most immediate hit. Background checks are routine, and a conviction for interfering with emergency communications signals poor judgment at best and violent tendencies at worst, especially when the underlying incident involved domestic violence. Jobs in healthcare, education, law enforcement, and anything requiring a security clearance become very hard to get.
Housing applications ask about criminal history, and landlords in tight rental markets routinely reject applicants with convictions. Because this charge often rides alongside domestic violence offenses, it can also affect custody disputes. Judges weigh criminal records, and a record suggesting the parent blocked another parent’s call for help during a dangerous situation weighs heavily.
Felony convictions carry additional losses. The defendant may lose the right to possess firearms under both federal and state law. Voting rights, eligibility for professional licenses, and access to public benefits may also be affected, depending on the jurisdiction and how the offense is classified.
Probation deserves its own note. A probation sentence isn’t a free pass. It typically requires regular check-ins with an officer, compliance with no-contact orders, completion of court-ordered programs, and staying out of trouble for the full probation period. A single violation can lead the court to revoke probation and impose the original jail or prison sentence.