Non-lethal guns are legal to own in every U.S. state, but whether they are legal to carry and use depends heavily on the device and the jurisdiction. Federal firearms law generally doesn’t reach stun guns, pepper spray, CO2 launchers, or airsoft and BB guns, because none of them use an explosive propellant. That leaves regulation almost entirely to the states, and the state rules are inconsistent enough that a Taser you carry legally in one city can lead to criminal charges an hour down the road.
Why Federal Firearms Law Usually Doesn’t Apply
Under federal law, a “firearm” is a weapon designed to expel a projectile by the action of an explosive.1Office of the Law Revision Counsel. 18 U.S. Code 921 – Definitions Stun guns use electrical current. Pepper spray uses pressurized aerosol. CO2 launchers use compressed gas. None of them meet that definition, so the major federal restrictions built around it, including background check requirements and the felon-in-possession ban, generally don’t apply.2Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF). Identify Prohibited Persons
The practical result is a near-total federal vacuum. States and cities fill it, and they don’t agree with each other.
The Constitutional Floor on Possession Bans
In Caetano v. Massachusetts (2016), the U.S. Supreme Court struck down a Massachusetts law that completely banned stun gun possession. The Court held that Second Amendment protections extend to all bearable arms, including ones that didn’t exist when the Constitution was written.3Justia Law. Caetano v. Massachusetts, 577 U.S. 411 (2016) That ruling didn’t make stun guns unregulated. States can still control how, when, and where you carry one. But a flat ban on mere possession is now on shaky constitutional ground, and several states that had prohibited stun guns entirely have since revised their laws.
What the Rules Look Like by Device
Tasers and Stun Guns
Both are legal for civilian ownership in most states, but the rules diverge. Some jurisdictions treat a projectile Taser more like a concealed handgun and require a permit to carry it, while allowing a direct-contact stun gun with fewer restrictions. Permit fees, where required, generally run from nothing up to about $100.
Some states require a background check to buy one. Others bar possession by people with felony convictions, those under a domestic violence restraining order, or people with certain mental health adjudications. Penalties for unlawful possession can include felony charges and prison time, which catches people off guard when they assumed “non-lethal” meant lightly regulated.
Pepper Spray
Pepper spray is the most widely legal non-lethal option, but two variables trip people up: chemical strength and canister size. Some states cap the concentration of oleoresin capsicum. Canister size limits range from as little as half an ounce to over five ounces, and many states set no size limit at all.
Bear spray is a separate trap. It’s registered with the EPA as a pesticide for use against animals, and its labeling restricts it to that purpose. Using bear spray on a person, even defensively, can be treated as misuse of a pesticide product and may bring assault charges. If you want a spray for personal defense, buy one labeled for that purpose.
CO2-Powered Launchers
These devices resemble handguns and fire pepper-filled or kinetic projectiles using compressed CO2. Because there’s no explosive propellant, the ATF does not classify them as firearms federally. State treatment is not uniform. Some states restrict certain chemical projectiles even when the launcher itself is legal. New York and Hawaii impose significant restrictions on either the launcher, its projectiles, or both. A manufacturer’s willingness to ship to your address is not a guarantee that carrying it there is legal.
Airsoft, BB, and Pellet Guns
Federal law requires airsoft guns to be sold with a permanently affixed blaze orange plug in the barrel. That marking requirement applies to airsoft specifically and does not cover traditional BB guns, pellet guns, or paintball guns, which are excluded from the definition of “look-alike firearm.”4Office of the Law Revision Counsel. 15 USC 5001 – Penalties for Entering Into Commerce of Imitation Firearms There’s no federal minimum age to purchase any of them. States set their own age rules, and many localities restrict public display or require these devices to be transported cased and out of sight. Using one to commit a crime can bring charges as severe as if you’d used an actual firearm.
One warning for anyone with a prior conviction: BB and pellet guns generally are not “firearms” under state felon-in-possession statutes because they don’t use explosive propellant. “Generally” does a lot of work in that sentence. Some jurisdictions define the term more broadly, and guessing wrong means a new felony. Check your state’s specific statutory definition before buying.
Who Can’t Legally Possess These Weapons
The federal felon-in-possession ban covers “firearms or ammunition,” so it usually doesn’t reach stun guns, pepper spray, or CO2 launchers.1Office of the Law Revision Counsel. 18 U.S. Code 921 – Definitions Many states have their own bans that do. State laws in a significant number of jurisdictions prohibit felons from possessing stun guns and Tasers. Some states extend restrictions to people with domestic violence convictions, those subject to protective orders, and individuals adjudicated as mentally incompetent. Pepper spray restrictions for felons are less common but exist in some states.
Age minimums are another layer. Most states set the floor for buying a stun gun or Taser at 18, and some go to 21. Pepper spray minimums are typically 18 but vary. Selling or giving any of these to a minor can carry its own penalties.
Where You Can’t Carry Them
Legal ownership doesn’t mean legal everywhere. Walking into a prohibited location with a Taser or a small canister of pepper spray can be a separate offense. Commonly restricted places include:
- K-12 schools and, in many states, college campuses
- Courthouses, legislative buildings, and other government offices
- Airports beyond security checkpoints
- Polling places during election periods, in many states
- Bars and, in some jurisdictions, large event venues
How you carry matters too. Some states distinguish open from concealed carry of Tasers. You might be allowed to wear one visibly on a belt but face charges for concealing it in a pocket without a permit. Where these distinctions exist, they usually track the state’s concealed-carry framework for firearms.
Flying and Shipping
TSA allows one container of pepper spray in checked baggage, up to 4 fluid ounces, with a safety mechanism to prevent accidental discharge. The spray can’t contain more than 2 percent tear gas (CS or CN). None is allowed in carry-on bags.5Transportation Security Administration. Pepper Spray Stun guns and Tasers are allowed in checked baggage as well, packed so they cannot accidentally discharge. Because many contain lithium batteries, TSA recommends confirming with the airline.6Transportation Security Administration. Stun Guns/Shocking Devices Clearing security doesn’t create an exemption at your destination. Landing in a state that bans your device won’t help you.
Mailing non-lethal weapons runs into hazardous materials rules. Pepper spray is classified with aerosols and is subject to quantity limits and packaging requirements for domestic surface mail; some formulations are prohibited from air mail entirely.7Postal Explorer – USPS. Publication 52 – Hazardous, Restricted, and Perishable Mail – Appendix A Private carriers set their own restricted-items policies. When ordering online, the seller usually handles carrier compliance, but confirming that the item is legal in your state is on you.
Using a Non-Lethal Weapon
Ownership and carry rights don’t give you permission to deploy the device whenever you feel uncomfortable. Self-defense law requires a reasonable belief that you face an imminent threat of bodily harm, and the force you use has to be roughly proportional to the threat.
Proportionality is where most people get it wrong. Tasing someone who is shouting but not physically threatening you is likely excessive. Spraying pepper spray at someone walking away from you after an argument is not self-defense. Using a “non-lethal” tool does not lower the legal bar. Courts evaluate the totality of the circumstances.
Your state’s broader self-defense framework then applies. In duty-to-retreat states, you may be required to attempt to safely withdraw before using any force. In stand-your-ground states, you typically have no duty to retreat if you are lawfully present. Whichever framework governs your state applies to non-lethal weapons the same as to any other use of force.
Civil Liability After You Use One
Avoiding criminal charges doesn’t end your exposure. The person you sprayed or Tased, or that person’s family, can sue you civilly. The two systems run independently: a district attorney can decline to prosecute while a plaintiff’s attorney files a personal injury claim. The civil burden of proof is also lower — more likely than not, rather than beyond a reasonable doubt.
Damages can include medical bills, lost wages, and pain and suffering. Some states have immunity statutes that shield people who use justified force, but the protections vary and often carve out grossly negligent conduct. Assume any defensive use of a non-lethal weapon can trigger both criminal scrutiny and a civil claim, and that your conduct before, during, and after the incident will be examined in both.