The XREP fits inside a special shotgun shell casing. Unlike standard shells, the cases for XREP devices are transparent. Taser chose transparent shells to make it easier for officers to identify the correct shell before loading it into a shotgun.

­Creating a device small enough to fit into a shotgun shell casing but powerful enough to incapacitate a subject was no easy task. The development team at Taser had to find a way to balance power with size. Not only did they need the device to travel farther than a standard Taser, but also to have the right amount of mass. If it had too little mass, it wouldn't travel far enough. But if it had too much mass, it could become a deadly projectile rather than a non-lethal solution.

Because Taser uses low-amperage currents, there's little danger of suffering electric burns or more serious side effects. But there's still the potential for complications. While Taser claims the amperage levels are well within safe levels, others aren't convinced. Several individuals have brought lawsuits against Taser charging that the company's product contributed to a person's death.

Or check with local osteopathic hospitals and state osteopathic medical associations. Also, many MDs and DOs practice together as members of the same group.

Why do Tasers work? What is it that makes them capable of incapacitating a human, no matter how large or strong that person might be? It all has to do with muscle physiology.

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There are times when law enforcement officers or military personnel need to subdue a person or group of people without using lethal force. They rely upon a variety of tools and tactics to achieve this goal. Some of those tools include items like riot shields, batons and tear gas. One less-than-lethal tool is the Thomas A. Swift Electric Rifle, or Taser.

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Only two types of medical doctors are recognized in the United States: MDs and DOs. Both are licensed by state and specialty boards to practice medicine, do surgery, and write prescriptions. Applicants to both DO and MD colleges usually have a 4-year undergraduate degree with an emphasis on science courses, and both complete 4 years of basic medical education.

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If the only contact with the subject is through the nose of the XREP, the microprocessor directs all pulses through those electrodes. That means a smaller area on the subject's body will be subject to the NMI effect.

When you apply a high-voltage, low-amperage electric charge to muscle tissue, it's as if you're overloading its communication system. Taser's electric pulses cause affected muscles to contract up to 19 times per second. Under normal conditions, your body moves by relaxing one set of muscles while contracting another. But if an electronic pulse hits your body, both sets of muscles may try to contract at the same time. Generally speaking, the stronger muscles win out. But because the pulses override the commands from your brain, you have no conscious ability to control their movements.

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As a result, the affected area of your body will tense up as the surrounding muscles contract. You may lose your balance and fall. Depending upon where you've been hit, you may not be able to break your fall or catch yourself. That's why people who have been hit by a Taser sometimes suffer superficial cuts, bumps and bruises.

Our bodies work using a combination of electrical and chemical signals to communicate commands from the nervous system to and from our other systems. When we want to flex a muscle, our brain sends electrical signals to special nerve cells. These nerve cells are transducers -- they convert energy from one format into another. In this case, the nerve cell converts the electrical energy from the brain into a c­hemical compound called a neurotransmitter.

Just like a normal shotgun shell, the XREP shell uses gunpowder as a propellant. The shotgun ejects the XREP casing just as it would any normal shotgun round. But instead of firing a slug or round of shot, the shotgun fires an electronic projectile weighing 3.4 grams (about .12 ounces) [source: Taser].

Taser was coined in the 1970s by its inventor, Jack Cover, who named it with an acronym based on the 1911 book that partly inspired the weapon: Tom Swift and ...

Taser's Web site says that most people tend to react the same way after suffering a blunt impact: They instinctively reach for the impact site. That's not such a great idea with the XREP. If the subject's hand makes contact with the XREP's reflex engagement electrodes, the microprocessor in the XREP diverts electricity and creates a circuit. Electricity flows from the electrodes into the subject's body and out through the hand that is touching the XREP. This spreads the effect of the XREP through more of the subject's body.

The 20 seconds of voltage emission allows the officer time to close the distance to the subject and restrain him or her. But the shotgun shell form factor also means the officer can load a second round into the gun and fire at another subject if necessary.

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With that in mind, Taser introduced a new concept in ECD technology -- the Taser eXtended Range Electronic Projectile (XREP). The XREP looks like a high-tech shotgun shell. That's not by accident -- Taser designed the XREP so that military or law enforcement officers could fire one from a standard 12-gauge shotgun. But instead of firing pellets or a slug, these shells fire a small, self-contained Taser device capable of delivering the same NMI effect as a handheld Taser gun.

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As the projectile clears the end of the shotgun's barrel, three spring-loaded fins deploy at its base. The fins cause the projectile to spin in flight, stabilizing its path. The projectile will spin even if the officer uses a smooth-bore shotgun.

But the typical Taser has a couple of limitations. Because the pins connect to the firing mechanism through wires, the typical Taser has a range limited to the length of the wires -- about 35 feet (10.6 meters). And while a Taser works well for taking down a single subject, it's not easy to reload a fired Taser device -- something that may be necessary in crowd control situations.

The base has six electrodes that unfold from the body of the projectile upon impact with a target. To help stabilize flight, the base of the projectile also has three spring-loaded fins that deploy upon ejection from the shotgun.

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A Taser is an electronic control device (ECD). The typical Taser device is a handheld gadget that fires a pair of pins tethered to the handset by electrical wires. The handset sends pulses of high voltage electricity to the pins. Anyone shot by a Taser will experience neuromuscular incapacitation (NMI). That means the subject will lose the ability to control his or her muscles -- the electric pulses cause muscles to tense. This usually results in the person falling down and gives law enforcement or military personnel time to restrain him or her.

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• The Taser Shotgun Shell's official name is the eXtended Range Electronic Projectile (XREP) and it works through neuromuscular incapacitation (NMI).

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We've created this resource to help your police department or law enforcement agency find the grants and funding that you need to better prepare your officers.

A group of prison guards face the worst case scenario -- a full-blown prison riot. The inmates pose a danger to one another and to the personnel working at the prison. The guards hope to use non-lethal force to end the riot early and spare human lives. Using shotguns loaded with XREP shells, they take aim at rioting prisoners and fire. What happens next?

But what if you see the letters DO? You might be surprised to learn that DO is an abbreviation for another type of physician: a doctor of osteopathic medicine, or osteopathic physician.

Although they sometimes focus on the back, these physicians are not chiropractors. OMT is a treatment very specific to how and where people injure themselves and how that injury can lead to symptoms.

Upon firing an XREP shell, the small charge in the shell activates, propelling the projectile down the barrel of the shotgun. A ripcord connecting the projectile to the shell goes taut and then breaks. This activates the projectile's battery, and 20 seconds of high-voltage charge begins to flow through the device.

Once the projectile makes contact with the target, several things happen in sequence. First, the four electrodes pierce the clothing and skin of the subject. Next, the impact causes a series of fracture pins to break. The fracture pins hold the nose to the base of the projectile. Once the pins break, the base of the projectile swings free of the nose. But it's still connected to the nose through two Kevlar-coated wires.

According to the American Osteopathic Association (AOA), osteopathic medicine is a complete system of health care with a philosophy that combines the needs of the patient with the current practice of medicine. Doctors of osteopathic medicine (DOs) practice a whole-person approach, which means they consider both the physical and mental needs of their patients. DOs strive to help patients be truly healthy in mind and body — not just free of symptoms.

• Our muscles rely on electrochemical signals sent from our nervous system. Millions of the signals pass through our bodies every second. A Taser overloads this communication system by introducing low-amperage, high voltage electricity.

Attending CES (formerly known as the Consumer Electronics Show) in Las Vegas is something I both look forward to and dread each year. The dread stems from the fact that the show is enormous -- it occupies the Las Vegas Convention Center, a 3.2-million square foot (297,290 square-meter) facility, with exhibition space spilling over into neighboring mega hotels. But each year I somehow discover something I find particularly interesting. The Taser Shotgun Shell definitely falls into that category. It's fascinating technology and absolutely terrifying all in one go. The idea of shooting someone with an electrified slug seems like the stuff out of a science fiction film but it's reality. The stopping power of a Taser is impressive and legitimately scary. The invention left such a huge impression on me -- figuratively speaking -- that I've sought out the Taser booth every year since.

The reason the XREP needs a step-up transformer is to create enough voltage to induce NMI in the target. Too few volts and the subject won't be incapacitated. Too many, and the target could be killed. To keep the Taser XREP from becoming a lethal weapon, Taser limits the amount of current flowing through the system to a few milliamps.

As the base of the projectile falls free, six Cholla electrodes unfold. The electrodes take their name from the Cholla cactus, which has barbed spines. If the Cholla electrodes pierce the subject's clothing and make contact with the skin, the microprocessor in the XREP channels electricity through both the nose and Cholla electrodes. This spreads the NMI effect over a larger area of the subject's body.

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Until June 2008, Taser either won every case or settled out of court. Taser lost its first case in California -- a jury found the company liable for the death of Robert C. Heston. Police officers hit Heston multiple times with Taser devices while attempting to subdue him in 2005. The jury concluded that the Taser strikes caused Heston's death. The Taser company plans to appeal the decision [source: Johnson].

Note: All information on Nemours® KidsHealth® is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor. © 1995-2024. The Nemours Foundation. Nemours Children's Health®, KidsHealth®, and Well Beyond Medicine® are registered trademarks of The Nemours Foundation. All rights reserved. Images sourced by The Nemours Foundation and Getty Images.

It's easy to recognize doctors just by reading their nametags. After all, they have the letters MD (for doctor of medicine) after their last names, right?

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This "holistic" approach to health care was developed by Dr. Andrew Taylor Still, who feared that 19th-century medicine was doing more harm than good. Disgusted at the ineffectiveness of fellow practitioners during the Civil War, he decided to focus on the body's ability to heal itself and began to stress preventive medicine. He also identified the musculoskeletal system as a key element of health, stressing that muscles, nerves, bones, and organs are all interrelated. In 1892, Dr. Still founded the American School of Osteopathy in Kirksville, Missouri.

­A transformer converts alternating current from one voltage to another through a series of coils wrapped around a core -- two wires coiled around an iron nail could be a simple transformer. As electricity travels through the first coil of wires around the core, it creates a magnetic field. The magnetic field induces an electric field, which causes electrons to travel through the second coil of wires. There are step-up transformers that increase the voltage from an incoming source of electricity or step-down transformers that decrease the voltage.

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­The neurotransmitter tells your muscle cells to contract. On a chemical level, the neurotransmitter causes muscle cells to release calcium within the cell. The calcium binds with the protein troponin, which regulates contraction. Muscle cells work together in huge numbers, making it possible for you to flex a bicep or lift a finger. When the cells stop receiving the command to contract, the calcium returns to a series of intercellular vesicles called the sarcoplasmic reticulum [source: National Skeletal Muscle Research Center].

Can ataserkill you

An electrical current's amperage refers to the number of electrons moving through the system. Voltage refers to the intensity or "pressure" pushing the electrons. It's possible to survive a high-voltage, low-amperage shock, but all it takes is 100 milliamps to interfere with your heartbeat [source: Lansing State Journal].

A key part of osteopathic medicine is a technique called OMT, or osteopathic manipulative treatment. In OMT, physicians use their hands as a primary tool to diagnose and treat illness and injury. This form of manual medicine lets DOs examine the back and other parts of the body (such as joints, tendons, ligaments, and muscles) for pain and restriction during motion that could signal an injury or impaired function.

The Province has approved the use of Taser 7 as an intermediate weapon for all police agencies in British Columbia.

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While the court decision is a setback for Taser, many people depend upon the company's products to provide a solution for situations that don't call for lethal force. It's likely we'll see more controversy as law enforcement and military personnel adopt the XREP in their weapons repertoire. One thing's for certain -- the results will be shocking.

The second half of the projectile contains the electronics that allow the XREP to transmit voltage to a target. This includes a battery, a transformer and a microprocessor that acts as both a trigger and a monitoring device. The battery stores the electricity the XREP uses upon deployment. The transformer's job is to convert the electricity from the battery into a higher voltage.

This projectile has two main sections. The nose of the projectile has four sharpened electrodes. These electrodes pierce the clothing and skin of the subject and serve as the main point of contact for the electric charge. Before impact, the nose and second stage of the projectile move as a single unit. A pair of Kevlar-coated wires tether the nose to the second half of the projectile.

• The purpose of the Taser is to incapacitate the target without causing severe injury, but there have been reports that some people have died as a result of being hit by a Taser. Taser disputes these claims and says that its products are safe to use under normal circumstances.

About 135,000 osteopathic physicians now practice in the United States. Because osteopathic schools emphasize primary care training, more than half of all DOs practice in areas such as pediatrics, obstetrics/gynecology, and internal medicine.