The "clearance rate", the percentage of homicides in which an arrest is made, is down to an historic low, according to The Marshall Project. The clearance in 2020 dropped a little below 50 percent. In the early 1980s, police were clearing about 70 percent of homicides.
Why are police only solving 1 in 2 murders? Many scholars and police department officials say murders are becoming more difficult to investigate, while some victims’ families say police spend too much energy on things other than solving crimes.
Philip Cook, a public policy researcher at the University of Chicago Urban Labs, has been studying clearance rates since the 1970s. He cautioned that fewer clearances than in the 1960s and ‘70s may not necessarily be a bad thing. “It also could be that the standards for making an arrest have gone up and some of the tricks they were using in 1965 are no longer available,” Cook said of law enforcement. Every story about a person convicted of murder on shoddy evidence and later exonerated was once counted as a “successful” homicide clearance.
Cook, and other experts, mostly pin the long, steady decline in clearance rates onto the kinds of homicides police are being asked to solve. Data from the Bureau of Justice Statistics shows that over time, a growing proportion of killings are being committed by strangers and unknown assailants, as opposed to people the victim knew. The data also shows that unknown assailants are increasingly using firearms rather than knives, fists or other close-quarter weapons. As the social and physical distance between killers and victims increases, detectives say they have fewer leads to follow.
But the changes in the nature of homicides — which some criminologists call case mix — are not destiny. Some cities routinely solve two or three times more homicides than others, even after accounting for case mix. Within departments, some detectives solve many more homicides than others.
“That variation tells us something important,” said Charles Wellford, emeritus professor in the Department of Criminology and Criminal Justice at the University of Maryland-College Park. “It says that it's not inevitable that there will be low clearance rates.”
Meanwhile, in communities where trust in law enforcement is low — often communities of color — homicide detectives have a hard time getting witnesses to talk to them, said Peter Moskos, a professor at the John Jay College of Criminal Justice.
“If people criticize the police constantly, it is natural that people would be less willing to talk to police,” Moskos said. Without useful leads, police solve fewer murders, and the perception that they are ineffective leaves witnesses and victims skeptical that talking to the police will do any good. In other words, Moskos said, it’s a vicious cycle.
There are many reasons people avoid speaking to the police, from the lack of confidence Moskos raised, to a fear of violent reprisals. According to Melina Abdullah, co-director for the national community organizing group Black Lives Matter Grassroots, another important reason is that police often criminalize crime victims — specifically in Black communities — treating them as suspects rather than survivors.
A police and prison abolitionist, Abdullah said that clearance rates are not useful measures for addressing violence in communities.
“Clearance rates, especially when we talk about acts of community violence, might give some kind of temporary sense of relief. But it's not justice,” Abdullah said. “I don't know anybody who's felt like, ‘OK, now I can rest because this murder has been cleared by the police.’”
Clearances don’t necessarily lead to criminal penalties like incarceration. In the nation’s 70 largest counties, nearly one-third of people accused of murder were acquitted or had their charges dismissed, according to a 2009 report from the Bureau of Justice Statistics. That’s the most recent year with local prosecution and conviction data available on the national level.
Shari O'Loughlin, chief executive officer at The Compassionate Friends, a national organization of support groups for families that have lost a child, says that an arrest or conviction “closes the information gap.”
“For most parents, siblings and grandparents who experience the loss, it’s critical for them to know what had happened,” O'Loughlin said. “But it’s not as if [an arrest] makes the loss, or the pain, better because nothing makes up for the loss of a child.”
And not knowing who killed their loved ones often means the family continues living in fear, said Jessica Pizzano, the director of victim services at Survivors of Homicide, Inc., a nonprofit organization that provides service to families of homicide victims in Connecticut.
“Is the murderer in my neighborhood? Will I run into them at the grocery store? Or when I’m pumping gas?” Pizzano said. “These are real fears that families live through.”
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