Non-lethal weapon
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Non-lethal weapons, also called nonlethal weapons, less-lethal weapons,[1][2][3][4] less-than-lethal weapons, non-deadly weapons, compliance weapons, or pain-inducing weapons are weapons intended to be less likely to kill a living target than conventional weapons such as knives and firearms with live ammunition. It is often understood that unintended or incidental casualties are risked wherever force is applied; however, non-lethal weapons minimise the risk of casualties (e.g. serious/permanent injuries or death) as much as possible. Non-lethal weapons are used in policing and combat situations to limit the escalation of conflict where employment of lethal force is prohibited or undesirable, where rules of engagement require minimum casualties, or where policy restricts the use of conventional force. However, these weapons occasionally cause serious injuries or death due to allergic reactions, improper use and/or other factors; for this reason the term "less-lethal" has been preferred by some organizations as it describes the risks of death more accurately than the term "non-lethal", which some have argued is a misnomer.[2][5][6][7]
Non-lethal weapons may be used by conventional military in a range of missions across the
History
Military

In the past, military and police faced with undesirable escalation of conflict had few acceptable options. Military personnel guarding embassies often found themselves restricted to carrying unloaded weapons. National guards or policing forces charged with quelling
Recognizing the need to limit the escalation of force, research and development of a range of non-lethal weapons has since been undertaken internationally by governments and weapons manufacturers to fill the need for such weapons. Some non-lethal weapons may provide more effective riot control than firearms, truncheons or bayonets with less risk of loss of life or serious injury. Before the general availability of early military non-lethal weapons in the mid 1990s, war-fighters had few or no casualty-limiting options for the employment of scalable force and were continually at risk whenever lethal force was prohibited during sensitive missions.
In 2001, the United States Marine Corps revealed its development of a less-than-lethal energy weapon called the Active Denial System, a focused high frequency microwave device said to be capable of heating all living matter in the target area rapidly and continuously for the duration of the beam, causing transient intolerable pain but no lasting damage. The skin temperature of a person subjected to this weapon can jump to approximately 130 °F (54 °C) in as little as 2 seconds depending on the skin's starting temperature. The system is nonlethal (the penetration of the beam into human skin is only a few millimeters).[10]
In 2004, author Jon Ronson cited an unclassified military report titled "Non-Lethal Weapons: Terms and References"[11][12] 21 acoustic weapons were listed, in various stages of development, including the Infrasound ("Very low-frequency sound which can travel long distances and easily penetrate most buildings and vehicles ... biophysical effects are projected to be: nausea, loss of bowels, disorientation, vomiting, potential internal organ damage or death may occur. Superior to ultrasound...)", however no such effects had been achieved as of 2002[update].[13]
In 2010, the Joint Non-Lethal Weapons Directorate Non-Lethal Weapons Reference Book was created. The weapons in this book are currently in development.[14]
Police
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Until the development of non-lethal weapons, police officers around the world had few if any non-lethal options for riot control. Common tactics used by police that were intended to be non-lethal or less lethal included a slowly advancing wall of men with batons, officers on horses trained to deal with policing situations, or a charge into a riot using the flats of sabers. Other reasonably successful approaches included shotguns with lower-powered cartridges, "salt shells", using
Police officers on patrol were traditionally armed with batons or pistols or both, and non-lethal methods of subduing an attacker centered on hand-fighting techniques such as
During the 1990s and early 2000s (decade), interest in various other forms of less-than-lethal weapons for military and police use rose. Amongst other factors, the use of less-than-lethal weapons may be legal under international law and treaty in situations where weapons such as aerosol sprays or gases defined as chemical are not.[citation needed]
Between the years of 1987–1990, after a three-year field study by the FBI's Firearms Training Unit; In 1990, the use of oleoresin capsicum was approved and used by the FBI, the first official law enforcement agency to do so.[citation needed]
In the late 1990s and early 2000s (decade), police began to adopt a new pepper spray delivery system based on the equipment used in paintball. A specialized paintball, called a "pepperball", is filled with liquid or powdered capsaicin, the active ingredient in pepper spray, and is propelled by compressed gas using a paintball marker similar to those used for the sport but operating at a higher pressure. The impact of the capsule is immediately painful (a pepperball's shell is thicker than a standard paintball and is fired at a higher velocity), and it breaks open on impact, dispersing the capsaicin with similar effect to aerosol-delivered pepper spray. However, to be most effective, pepper spray must contact the eyes, nose, or mouth of the target; pepper spray on clothing or tougher skin has a much reduced effect.[citation needed]
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Long range acoustic device mounted on police vehicle, 2004 Republican National Convention, New York City
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Swedish police in riot gear, carrying an extended telescopic baton
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A Taser X26 making an electrical arc between its two electrodes
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Pepper spray training
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Exploded tear gas canister in the air
Effects
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Non-lethal weapons have a design intent to provide an effect to reliably elicit a degree of incapacitation but without the typically lethal or permanent lasting effects of conventional weapons. This design intent has often made them a weapon of choice for use by law enforcement during civil protests, etc. Effect modalities vary by the technology being employed: kinetic projectiles function by blunt impact which actuate pain receptors to elicit a behavioral change, lights affect visual perception, acoustics affect hearing, etc.[citation needed]
Notwithstanding their design intent, non-lethal weapons can still cause harm. This is particularly true with certain technologies that interact with appropriately vulnerable regions; an example is kinetic munitions on the head, neck, eyes, abdominal and urogenital regions of the body.[15] As a result, some analysts describe "non-lethal" as a misnomer and recommend defining them as "less-lethal",[16] whereas other sources identify "non-lethal" as representing a goal of minimization of producing fatalities or permanent injuries[17] while not literally requiring minimization to a zero probability thereof.
Mechanics
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Non-lethal weapons are intended to minimize injury or death. While people are occasionally seriously injured or killed by these weapons, fatalities are relatively infrequent. Causes of death from non-lethal weapons are varied and occasionally uncertain. Misplaced or ricocheting shots, pre-existing medical conditions, inadequate user training, repetitive applications and intentional misuse have been implicated in different cases where death has occurred.[citation needed]
As different parts of the body differ in vulnerability, and because people vary in weight and fitness, any weapon powerful enough to incapacitate may be capable of killing under certain circumstances. Thus, "non-lethal force" does have some risk of causing death: in this context, "non-lethal" means only "not intended to kill".[citation needed]
Several groups maintain there is great room for improvement in non-lethal weapons and procedures for their use. Claims for the relative safety of such weapons are usually contingent on their being used "properly". For example, the rubber bullets developed during the 1960s were supposed to be fired at the ground and hit the target only after ricochet,[18] and other non-lethal bullets are designed to be fired at the lower body; they can be lethal if fired directly at the head.[citation needed]
Ammunition
Non-lethal rounds are
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Fiocchi 12-gauge rubber buckshot: containing 15, 8.3 mm, .58 gram rubber pellets, with a muzzle velocity of 790 fps.
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12-gauge beanbag rounds and exposed bean bag round projectile
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U.S. M234 launcher ring airfoil projectile rounds
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Launcher, projectile, 64 mm, riot control, M234
Explosives
In 1972, stun grenades were used to capture the hijacked Sabena Flight 571, allowing the Israeli forces headed by Ehud Barak and including Benjamin Netanyahu to storm the plane and take it over within 10 minutes while capturing two terrorists and killing Ali Taha, the leader of the terrorist group and his aide, while rescuing all passengers (three were wounded, and one died of her injuries several days later).[22]
A stun grenade was apparently used by members of the
In June 2010, in Kenya, a stun grenade was used to draw attention, and then a real grenade along with an explosive package were used, killing many people. In April, during the
In February 2011, stun grenades were seen used by Egyptian police against rioters.[citation needed]
Gases and sprays
Water

Water cannons are commonly used in crowd and riot control, for dispersal or to prevent movement on a particular position. These water cannons are intended to disperse crowds with little risk of harm, but the pressure can still cause eye injuries or even death. Water-filled rounds for small arms are in experimental stages.[24] Electrified water cannons were in development but was abandoned.[citation needed]
Scent-based weapons
Pepper spray
The active ingredient in pepper spray is oleoresin capsicum (OC), an acrid irritant chemical derived from cayenne pepper plants.[26]
A 1998 estimate by the International Association of Chiefs of Police suggested at least 113 pepper spray-related fatalities had occurred in the United States, all with aggravating factors such as intoxication, pre-existing health problems, or from the police use of airway-restrictive immobilizing holds that can cause positional asphyxia.[27] The Southern California chapter of the American Civil Liberties Union recommends against maximal prone restraint techniques following pepper spray application, and they caution that anyone sprayed should be monitored to ensure effective breathing.[28]
Tear gas

The use of chemical weapons such as tear gas (CS) and pepper spray (OC) has come under increasing scrutiny and criticism due to studies showing serious long term side effects. Many police forces are no longer exposing their members to the chemicals during training.[citation needed][29]
Journalist
Psychochemical
Sleep gas
During the 2002
Other chemical agents
Blister agents, including CR gas, are less often used riot control agents. Other irritants include CS gas and nonivamide (PAVA).[citation needed]
Sticky foam
Area denial
Area denial weapons work by either incapacitating or deterring the enemy.[citation needed]
Anti-vehicle

Vehicle stoppers include a wide range of methods and devices meant to disable a vessel or vehicle to prevent attack by an oncoming vessel or vehicle or to stop that vessel or vehicle for evaluation. Vessel and vehicle stoppers may include kinetic, chemical, or electromagnetic means.[33][34][35]
Anti-personnel
Caltrops
Simple rows or clusters of sharpened sticks (also known as
However, due to the difficulty of mass-producing them in the pre-modern age, they were rarely used except in the defense of limited areas or chokepoints, especially during sieges, where they were used to help seal breaches. Increasing ease of production still did not prevent these methods from slowly falling out of favor from the late Middle Ages onward.[36]
Caltrops are still sometimes used in modern conflicts, such as during the Korean War, where Chinese troops, often wearing only light shoes, were particularly vulnerable.[36] In modern times, special caltrops are also sometimes used against wheeled vehicles with pneumatic tires. Some South American urban guerrillas as the Tupamaros and Montoneros called them "miguelitos" and used these as a tactic to avoid pursuit after ambushes.[37]
Riot gun

In current usage a riot gun or less-lethal launcher is a type of firearm that is used to fire "non-lethal" or "less-lethal" ammunition for the purpose of suppressing riots. Less-lethal launchers may be special purpose firearms designed for riot control use, or standard firearms, usually shotguns and grenade launchers, adapted to riot control use with appropriate ammunition. The ammunition is most commonly found in 12 gauge (18.5 mm/.729 inch) shotguns and 37mm (1.46 inch) or 40mm (1.57 inch) grenade launchers.
In the United States, the term "riot gun" more commonly refers to a riot shotgun that shoots baton rounds or bean bag rounds.
In recent years, law enforcement,
Electroshock weapons
Electroshock weapons are incapacitant weapons used for subduing a person by administering electric shock aimed at disrupting superficial muscle functions. One type is a conductive energy device (CED), an electroshock gun popularly known by the brand name "Taser", which fires projectiles that administer the shock through a thin, flexible wire. Other electroshock weapons such as stun guns, stun batons, and electroshock belts administer an electric shock by direct contact.[citation needed]
Directed energy weapons
Directed energy weapons are weapons that emit energy in an aimed direction without the means of a projectile. They are non-lethal and can immobilize people as well as machines (e.g. vehicles).
Ultraviolet laser
HSV Technologies, Inc. (named for its founders, Herr, Schlesinger and Vernon; not to be confused with Holden Special Vehicles), formerly of
Pulsed energy projectile
The pulsed energy projectile is intended for riot control and is said to work over distances of up to 2 km. It weighs about 230 kg and will probably be mounted on vehicles. The weight could become lighter as laser production technology improves.[citation needed]
The system was developed by
In 2003, a US military review reported[citation needed] that the electromagnetic radiation produced by PEPs had been shown to cause pain and temporary paralysis in animal experiments.[citation needed]
United States Special Operations Command FY 2010 plans included starting developmental work on a counter UAV pulsed energy projectile.[43]
Active denial system
An active denial system (ADS) is a dish that projects electromagnetic radiation just powerful enough to penetrate human skin and make the victim feel as though they are on fire, although no physical damage is done.[citation needed]
The ADS is a non-lethal, directed-energy weapon developed by the US military,[44] designed for area denial, perimeter security and crowd control.[45] Informally, the weapon has also been referred to as a "heat ray",[46] since it works by heating the surface of targets, such as the skin of targeted human subjects.[47]
In 2011, the ADS was redesigned to make it smaller, more reliable, and able to be used on the move. The ADS II is being designed to operate from moving aircraft, as well as moving ground vehicles. The redesign does not address problems in different environmental conditions.[48]
Air Force Special Operations Command is experimenting with mounting an ADS on the AC-130J Ghostrider gunship to target threatening crowds or individuals on the ground. This is to give the gunship a non-lethal option so the crew has more engagement options. Due to the increasing number of engagements in populated areas, the Air Force is aiming to field a system within 10 years to have enough aircraft available with non-lethal systems.[49] The aircraft will apparently use the ADS II version.[50]
Dazzler
A
Initially developed for military use, non-military products are becoming available for use in law enforcement and security.[51][52]
Weapons designed to cause permanent blindness are banned by the 1995

The
Blinding laser weapons
Several nations developed blinding laser weapons and they were allegedly used during the war in Donbas by Russia.[56]
Long Range Acoustic Device
The
According to the manufacturer's specifications, the systems weigh from 15 to 320 pounds (6.8 to 145.1 kg) and can emit sound in a 30°- 60° beam at 2.5 kHz.[59] The manufacturer also produces systems for public address and mass notification use that broadcast 360°.[60]
Safety and legal status
In the United States, the University of Texas-Austin Institute for Advanced Technology (IAT) conducts basic research to advance electrodynamics and hypervelocity physics related to electromagnetic weapons.[61]
Although generally considered "non-lethal weapons", electromagnetic weapons do pose health threats to humans. In fact, "non-lethal weapons can sometimes be deadly."[62]
Misuse
Pepper spray is one non-lethal weapon alleged to have been misused by American police. In two incidents in California in 1997, police swabbed pepper spray directly into the eyes of protesters.[66] Amnesty International condemned these actions, and claimed that they were likely a violation of the 1984 United Nations Convention Against Torture.[66]
Terrorism concerns
Loren Thompson, chief operating officer of the
Suitable materials and tools to create electromagnetic weapons are commonly available. "The threat of
See also
- Demoralization (warfare)
- Electronic warfare
- Gas pistol
- LED Incapacitator
- Net gun
- New physical principles weapons
- Pain compliance
- Peroneal strike (hand-to-hand technique)
- R.I.P. cartridge
- Stun belt
- Tranquillizer gun
Notes
- ^ Michigan State Police Training Manual 2012 (pp. 68-70): same effective definition for "Less-lethal weapons" as what DoDD 3000.03 (2013) has for "Non-lethal weapons"
- ^ a b Less Than Lethal Weapons, UN Peacekeeping PDT Standards for Formed Police Units 1st edition 2015 (PDF). 2015. Archived from the original (PDF) on 2021-08-16. Retrieved 2020-06-05.
- ^ United Nations Human Rights Guidance on Less-Lethal Weapons in Law Enforcement (PDF). 2020.
- ^ "Use of force, firearms and less lethal weapons". College of Policing. 2020. Retrieved 26 June 2020.
- ^ "There's No Such Thing as a 'Non-Lethal' Weapon". Vice.com. 21 October 2014. Retrieved 2022-05-05.
- PMID 15839010.
- ^ "Taser and the Myth of Non-Lethal Weaponry – The Intercept". Theintercept.com. 2015-12-01. Retrieved 2022-05-05.
- ^ Nonlethality: A Global Strategy Archived 2012-03-05 at the Wayback Machine
- ^ War and Anti-War, Alvin Toffler and Heidi Toffler, Little, Brown (1993), Chapter 15, p.125–136.
- ^ Shachtman, Noah (2007-04-06). "Pain Ray Injures Airman". Wired.
- ISBN 0-7432-4192-4. Retrieved 2007-08-28.
- ^ "USAF Institute for National Security Studies: Non-Lethal Weapons: Terms and References". Archived from the original on 2010-03-04. Retrieved 2010-02-15.
- ^ "National Defense Magazine". Archived from the original on July 19, 2010.
- ^ "(U//FOUO) DoD Non-Lethal Weapons Reference Book 2011 - Public Intelligence". 27 December 2011.
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- PMID 29255079.
- ^ Lewer, Nick; Davison, Neil (2005). "Non-lethal technologies—an overview" (PDF). Disarmament Forum. 1: 37–51.
- ^ United States Department of Defense (July 9, 1996), DOD Directive 3000.3: Policy for Non-Lethal Weapons (PDF)
- ^ "Study Says Rubber Bullets Too Dangerous For Civil Crowd Control, from AP, 2002". Archived from the original on 2010-06-30. Retrieved 2010-02-15.
- ^ "PepperBall® | Non Lethal Weapons | Less Lethal | Police Non Lethal". pepperball.com.
- ^ Hambling, David (2008-07-23). "Army Looks to Turn Toy Into Next-Gen Rifle". Wired.
- ^ "Stinger® CS Rubber Ball Grenade". Defense Technology. Retrieved 2025-03-05.
- ISSN 0261-3077. Retrieved 2023-12-30.
- ^ "Global News Blog". Christian Science Monitor. June 2, 2010. Retrieved May 19, 2012.
- ^ "Health Impacts of Crowd-Control Weapons: Water Cannons". PHR. Retrieved 2022-07-18.
- ^ "New Israeli weapon kicks up stink". 2008-10-02. Retrieved 2019-06-10.
- ^ Edwards, Steven M.; Granfield, John; Onnen, Jamie (February 1997). "Evaluation of Pepper Spray" (PDF). Research in Brief. National Institute of Justice. Retrieved August 6, 2013.
- ^ Allen, Terry J. (May 29, 2000). "Tear Gas: Chemical Cops". In These Times. Retrieved October 4, 2011.
- ^ "Pepper Spray Update: More Fatalities, More Questions" (PDF). ACLU of Southern California. June 1995. Archived from the original (PDF) on September 29, 2011. Retrieved October 4, 2011.
- PMID 27391380.
- ^ "Oakland Police Critically Injure Iraq War Veteran During Occupy Protest". The Huffington Post. 2011-10-26. Retrieved 2016-01-08.
- ^ Rózsa L 2009. A psychochemical weapon considered by the Warsaw Pact: a research note. Substance Use & Misuse, 44, 172-178. Archived 2011-07-21 at the Wayback Machine accessed: 27. 11. 2009.
- S2CID 111371006. 1997SPIE.2934...96S.
...describes these recent developments of sticky foam for non-lethal uses and some of the lessons learned from scenario and application testing.
- ^ ISBN 142899193X.
- ^ "Pulses immobilize cars with RF Safe-Stop from e2v". phys.org.
- ^ "Savelec project - Home Page". Archived from the original on 2017-07-04. Retrieved 2014-10-25.
- ^ a b c "Weaponry: The Caltrop", Reid, Robert W., originally in Military History, August 1998
- ^ "Tupamaros. De las armas a las urnas". rcci.net.
- ^ FAQ Page of Vendor PepperBall Technology - Retrieved October 7, 2011 Archived September 8, 2011, at the Wayback Machine
- ^ Product Page of Vendor PepperBall Technology - Retrieved October 7, 2011 "PepperBall Technologies Incorporated | Products". Archived from the original on 2011-10-07. Retrieved 2011-10-06.
- ^ FN 303 projectiles Product Page - Retrieved October 7, 2011
- ^ "HPEM Active Denial System disabling vehicles". Archived from the original on 2009-03-06. Retrieved 2009-04-29.
- ^ "lasik". Archived from the original on 2018-04-18. Retrieved 2019-07-08.
- ^ Pike, John. "Pulsed Energy Projectile (PEP)".
- ^ "Vehicle-Mounted Active Denial System (V-MADS)". Global Security. Archived from the original on March 5, 2008. Retrieved March 2, 2008.
- ^ "DVIDS - News - New Marine Corps non-lethal weapon heats things up". DVIDS. Retrieved November 1, 2014.
- Boston Globe, September 24, 2004.
- ^ "Joint Intermediate Force Capabilities Office > About > Frequently Asked Questions > Active Denial System FAQs". jnlwp.defense.gov. Retrieved 2022-07-18.
- ^ Death Ray Turns Warm And Fuzzy – Strategypage.com, October 3, 2012
- ^ US Special Forces pursuing AC-130-based 'active denial system' - Flightglobal.com, 29 July 2015
- ^ AC-130J Gets A Ray Gun - Strategypage.com, 10 August 2015
- Techradar.com. Retrieved 28 July 2010.
- ^ Chris Matyszczyk (23 July 2010). "Police to experiment with blinding 'Dazer Laser'?". CNET.com. Archived from the original on 25 October 2012. Retrieved 28 July 2010.
- ^ Eva D. Blaylock (Air Force Research Laboratory Directed Energy Directorate Public Affairs). New technology 'dazzles' aggressors, The Official Website of the U.S. Air Force, Posted November 2, 2005
- ^ "United Nations Office at Geneva". www.unog.ch. Retrieved 15 January 2009.
- ^ PERSONNEL HALTING and STIMULATION RESPONSE (PHaSR) Fact Sheet, Air Force Research Laboratory, Office of Public Affairs, April 2006; Archived
- ^ "UAWire - Three Ukrainian border guards in the Donbas suffer retina burns after being shot with laser weapons". uawire.org.
- ^ "Long Range Acoustic Device Industry Applications - Public Safety & Security Solution". Archived from the original on 2017-03-10. Retrieved 2016-08-07.
- ^ Sheets, Tess (25 June 2020). "P.A. system or 'sonic weapon'? Cops' use of military-grade speakers at Orlando protests prompts backlash". orlandosentinel.com. Retrieved 2021-07-04.
- ISBN 978-0-9562107-0-8.
- ^ "LRAD Mass Notification & Life Safety Systems Archives - LRAD Corporation". Archived from the original on 2017-03-10. Retrieved 2016-08-07.
- ^ Exploiting Technical Opportunities to Capture Advanced Capabilities for Our Soldiers; Army AL&T; 2007 Oct-Dec; Dr. Reed Skaggs Exploiting Technical Opportunities to Capture Advanced Capabilities for Our Soldiers Archived 2011-07-22 at the Wayback Machine
- ^ Air University Research Template: "NON-LETHAL WEAPONS: SETTING OUR PHASERS ON STUN? Potential Strategic Blessings and Curses of Non-Lethal Weapons on the Battlefield"; Erik L. Nutley, Lieutenant Colonel, USAF; August 2003; Occasional Paper No. 34; Center for Strategy and Technology; Air War College; Air University; Maxwell Air Force Base, Alabama; PG12
- ^ Department of Defense; DIRECTIVE; NUMBER 3000.3; July 9, 1996; Certified Current as of November 21, 2003; ASD(SO/LIC); SUBJECT: Policy for Non-Lethal Weapons; References: (a) Title 10, United States Code; (b) DoD Directive TS-3600.1, "Information Warfare (U)", December 21, 1992; PG. 3
- ^ Human Effects Advisory Panel Program Archived 2004-11-14 at the Wayback Machine; presented to: NDIANon-Lethal Defense IV
- ^ Non-Lethal Weaponry: From Tactical to Strategic Applications Archived 2003-12-23 at the Wayback Machine; Colonel Dennis B. Herbert, USMC (Ret.), program developer, Institute for Non-Lethal Defense Technologies at Pennsylvania State University; pg. 4
- ^ a b USA: Police use of pepper spray - tantamount to torture. Amnesty International, 4 November 1997.
- ^ Inside the Pentagon; Cebrowski calls for cultural changes; DEFENSE OFFICIALS URGE COMMON FRAMEWORK FOR PRECISION ATTACKS; April 3, 2003 [1][permanent dead link ]
- ^ "The Electromagnetic Bomb - a Weapon of Electrical Mass Destruction". 10 December 2000. Archived from the original on 10 December 2000.
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External links
- Council on Foreign Relations Independent Task Force Report on Nonlethal Weapons
- usmilitary.about.com (Non-lethal weapons)
- Weapons of Mass Protection, Air Force Journal article on Nonlethal Weapons.
- The Sunshine Project, 'Non-Lethal' Incapacitating (Bio)Chemical Weapons (website)
- Centre for Conflict Resolution, Department of Peace Studies, Bradford Non-Lethal Weapons Research Project (BNLWRP), Research Report No. 8
- Time - Beyond the rubber bullet
- Less-Lethal.org - Non Lethal and Less Lethal Law Enforcement Technologies. Hosted by the International Association of Chiefs of Police (IACP).
- US Deptment of Defense Non-Lethal Weapons Program.
- Field Manual No. 19-15 Headquarters Department of the Army Washington, DC, 25 November 1985 FM 19-15 CIVIL DISTURBANCES
- "Documenting Police Use of Force". Frontline. Season 42. Episode 15. April 30, 2024. PBS. WGBH. Retrieved September 30, 2024.