What Is a Clearance Rate?
A homicide is "cleared" when law enforcement makes an arrest and charges a suspect, or when the case is closed due to exceptional circumstances (e.g., the suspect dies before arrest).
The national homicide clearance rate — the percentage of cases that get solved — has been declining for decades. In the 1960s, over 90% of homicides were cleared. Today, the national average hovers around 50%.
That means roughly half of all murders in the United States go unsolved.
Why Clearance Rates Are Falling
Several factors explain the decline:
The witness problem. Many homicides occur in communities with historically adversarial relationships with police. Fear of retaliation and distrust of law enforcement reduce witness cooperation. Without witnesses, most homicide cases go cold.
Resources and staffing. Homicide units in major cities are chronically understaffed. Detectives carry caseloads that would have been unthinkable a generation ago. When a new killing happens, an older case gets deprioritized.
The shift in homicide geography. Decades ago, homicides were more often crimes of passion — domestic disputes, bar fights — where the perpetrator was known to the victim and often obvious to investigators. Today, more homicides are stranger-to-stranger events tied to drug markets or interpersonal conflicts, which are structurally harder to solve.
Forensics help less than TV suggests. Forensic evidence matters in some cases, but most homicide investigations are solved through human intelligence — witnesses, informants, surveillance footage. When those fail, forensics rarely saves the case.
The Racial Disparity
Here is the most uncomfortable fact in homicide clearance research: cases involving Black victims are cleared at significantly lower rates than cases involving white victims.
Multiple analyses have found that cities across the US clear homicides involving white victims at roughly twice the rate as those involving Black victims.
This disparity reflects broader patterns of resource allocation, geography, and investigative priority. It's a systemic failure with serious consequences for justice and community trust.
What Would Improve Clearance Rates?
Researchers and practitioners point to several evidence-based interventions:
- Group violence intervention programs that focus on the small number of individuals most likely to kill or be killed
- Dedicated cold case units with the time and resources to reopen old investigations
- Community trust-building — departments that invest in this consistently outperform on clearance rates
- Witness protection — many witnesses want to cooperate but face genuine safety risks
None of these are easy or cheap. But the alternative — a world where half of all killers face no consequence — carries its own costs.