Tasers are by far law enforcement's most commonly used conducted energy weapon. Its manufacturer, Axon, wouldn't speak with us on camera, but materials the company provided cite findings of independent studies that 99.75 percent of incidents in which a Taser was used did not result in serious injury, and that, of the tools available to police to exert force, a Taser is least likely to result in significant injury, less likely even than unarmed physical force.

It can be a deadly weapon, in the hands of Raleigh Police Department officers, clearly, because Darryl Tyree Williams is no longer with us.

For many years, police use of force against people of color, especially Black Americans, has been under intense scrutiny. Tasers, also known as conducted electrical or energy weapons, may be ranked below guns on the spectrum of police force, but using them has resulted in deaths. John Yang reports. A warning: some images in this report may disturb viewers.

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That's Tasers' key selling point. Axon estimates that about 285,000 lives have been saved or serious injuries prevented because police used their devices, instead of a gun.

John Yang is the anchor of PBS News Weekend and a correspondent for the PBS News Hour. He covered the first year of the Trump administration and is currently reporting on major national issues from Washington, DC, and across the country.

Darryl was not trying to harm law enforcement. He did not pose a physical threat. He was trying to get away. He was trying to save his own life.

In June, Wake County district attorney Lorrin Freeman announced that she was not bringing criminal charges against any officers in connection with Williams' death.

Sonya Williams, Mother of Darryl Tyree Williams: He was a good person. You know what I'm saying? I'm not going to say that he was perfect. He had his flaws, like we all do. But he was loved by everyone. He didn't have no enemies.

The reality is, we need an entire paradigm shift around when force is necessary for law enforcement, even if it is nonlethal weapons. If it is used with the intent to cause harm, to cause pain, to punish someone, that is always going to result in the people of Raleigh and anywhere else being in danger of death for even simple interactions with law enforcement.

Among the circumstances she says led her to her conclusion, what she calls the limited uses of Tasers on Williams, none longer than five seconds, the question of whether officers heard Williams tell them about his heart condition, and the complications posed by the autopsy report, which cited a combination of factors contributing to Williams' death, rather than a single cause.

Bozeman says decades of research on Tasers have established that they are safe, even if there are rare instances in which they contribute to a death.

As John Yang reports, Tasers may rank below guns on the spectrum of police force, but using them has resulted in deaths.

Ultimately, without the intervention of other human beings, namely, the Raleigh Police Department, Darryl would not have died on that night. If this were some random non-law enforcement citizen who had committed a crime that resulted in the death of someone else, that person would be charged.

The lead author of both studies is Dr. William P. Bozeman, an emergency medicine professor at Wake Forest University School of Medicine. He says his work is not funded by Axon.

Police were in the predominantly Black neighborhood on what they call proactive patrol, because, they said, officers are frequently called to the area. In Williams' pants pocket, an officer finds a folded $1 bill with a white powdery substance.

Mike Gish, Vice President of Taser Product Management, Axon Enterprise: We owe public safety and communities a better way to stop threats without having to take a life.

An autopsy concluded that Williams died from sudden cardiac arrest in the setting of cocaine intoxication, physical exertion, conducted energy weapon use, and physical restraint. The death was ruled a homicide.

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The officer draws his yellow Taser and fires. Its probes make contact with Williams and deliver an electrical charge designed to temporarily paralyze him. Williams momentarily breaks free and is Tased again.

Has anyone seen "no dog" (or more commonly, no poop) signs on their neighbors' front lawn? It seems to be every other house on my street. I'm trying to be respectful, but it's really hard to keep an excitable puppy off the grass while we're on the sidewalk. How do you approach these kinds of wishes?

Six officers involved in Williams' death were placed on paid administrative leave. The Raleigh Police Department declined an interview request and wouldn't go beyond a written statement.

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Dawn Blagrove is executive director of Emancipate NC, a North Carolina group that focuses on race and policing in mass incarceration. She's also one of the lawyers representing the Williams family.

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Background: I have a 4 month old goldendoodle who was just cleared for "paws on pavement." We have a lot of work to do to get him comfortable with walking on a leash in a stimulating environment (meaning, outside our backyard). I want to be respectful of my neighbors' wishes, but it's difficult to keep him completely off the grass when we're on the sidewalk. I try not to have him potty on my neighbors' grass (hasn't done it yet), but I'm get anxious that my neighbors will run out screaming if his paws even tough their grass.

Kalfani Ture is a professor of criminal justice at Widener University and a former Police Officer. He says police shouldn't use Tasers since officers can't know if a target has health problems.

The events leading up to Darryl Williams' death began unfolding at about 2:00 a.m. on a January morning. Williams was sitting in a parked car on Raleigh, North Carolina's southeast side.

At the end of the day, the law enforcement actions while difficult to watch, while leading to a very tragic end, were lawful and in some instances were what were necessary at that point in time to bring the situation under control.

I don't have anything against the Tasers. I just think it's the way they use it. They used excessively on my child. And until something be done about it, they're going to keep on doing it.

In all, officers had Tased Williams four times. About an hour later, Williams was pronounced dead at a hospital. He was 32 years old.

Now that the district attorney has decided not to do anything, Sonya Williams and her attorney said they are exploring their options in their pursuit of accountability for the police and justice for Darryl Tyree Williams.

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There is no authoritative database of deaths that follow the use of a conducted electrical weapon. But a 2017 investigation by Reuters put the tally at more than 1,000, nearly all of them since the early 2000s.

Sam Weber has covered everything from living on minimum wage to consumer finance as a shooter/producer for PBS NewsHour Weekend. Prior joining NH Weekend, he previously worked for Need to Know on PBS and in public radio. He’s an avid cyclist and Chicago Bulls fan.

Darryl Williams lost his life because the Raleigh Police Department apparently doesn't have anything better to do than to harass Black and brown people.

Much of the attention is on firearms, but types of force considered to be less lethal, like choke holds and Tasers, are also getting a closer look.

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ETA: we don’t have strips of grass between the sidewalk and the road unfortunately, and the sidewalk is very narrow (one person at a time).

Ever since a police officer fatally shot 18-year-old Michael Brown in Ferguson, Missouri, almost nine years ago, police use of force against people of color, especially Black Americans, has been under intense scrutiny.

It said it is department policy that: "A conducted energy weapon shall only be used in response to active resistance." The statement adds: "It is important to note that our officers are required to make split-second decisions in quickly evolving circumstances."

A Taser can absolutely kill you. Whether it can do that by a cardiac means is still a topic of discussion. But there have clearly been cases where people were standing in an elevated position, and they were struck with a Taser, and the muscular lockup occurred, and they fell and they had a major head injury, and they died.