Louisville police helped build a firearm tracing tool that could spread to other cities

Louisville’s gun data test

A tool shaped with help from Louisville police could change how quickly investigators follow a recovered gun. The issue matters now because cities are looking for faster ways to connect shootings, suspects, and firearms before leads go cold.

Mark43 announced the crime gun data interfaces on June 25, 2026. The company said the system connects police records with ATF tools used for firearm tracing and ballistic intelligence.

What the new tool does

The tool is designed to move firearm information from a police records system into ATF systems without repeated manual entry. Investigators can enter details such as make, model, caliber, and serial number once.

That matters because many agencies still copy the same information into separate systems by hand. Mark43 says the new workflow can send data to ATF systems faster and reduce errors.

The old delay was costly

Louisville Metro Police processes more than 3,500 firearms each year, according to Mark43. Before the new setup, officials said manual, batch-based submissions could take 10 to 14 days.

The company says Louisville cut cycle time by 95%, with some turnaround times falling to about six hours. It also estimated more than 3,500 staff hours and $157,500 in labor savings each year.

Why ATF tracing matters

Firearm tracing is handled through ATF’s National Tracing Center, the only crime gun tracing facility in the United States. ATF says it traces firearms for law enforcement agencies working on real criminal investigations.

The work can help identify a firearm’s movement from manufacturer or importer through the distribution chain to the last known retail purchaser. That information can point investigators toward possible traffickers, suspects, or illegal purchasing patterns.

Little-known fact: ATF says eTrace is used by more than 10,500 law enforcement agencies to submit firearm trace requests.

Two systems do the work

The Louisville-linked tool connects with two ATF systems: eTrace and the NIBIN Enforcement Support System. eTrace supports firearm tracing, while NIBIN compares ballistic evidence from shootings and recovered guns.

ATF says NIBIN had more than 7.7 million pieces of ballistic evidence stored as of June 2026. In fiscal year 2025, 418 NIBIN locations generated more than 193,000 leads.

Louisville brings urgency

Louisville has been under pressure to reduce gun violence after years of high homicide totals. The city’s violence prevention office says Louisville recorded nearly 900 homicides between 2020 and 2025, and 91 percent involved a firearm.

That makes faster firearm intelligence more than a back-office upgrade. For families waiting on answers, shaving days off a trace can matter when investigators are trying to connect a gun to a shooting.

Little-known fact: ATF says 56 law enforcement agencies in 52 countries partner with ATF in tracing firearms through eTrace.

Crime is falling, cases remain

National crime numbers are improving, but that does not remove the need for better investigations. The FBI’s preliminary 2025 data showed violent crime fell 9.3 percent from 2024, while murder and non-negligent manslaughter fell 18.1 percent.

Those declines still leave thousands of violent cases for local detectives. Cities are now trying to use data faster, especially when one gun may be linked to more than one crime scene.

Speed can change a case

ATF says timely turnaround is one of the key steps for successful use of NIBIN. That is because firearm evidence can lose value when investigators wait too long to act on a lead.

Fast results can help police see whether a gun, casing, or shooting is connected to another case. It can also help prosecutors build stronger timelines when a firearm appears across multiple investigations.

Other cities may follow

The tool is not just a Louisville project anymore. Mark43 says the crime gun data interfaces are now available to U.S. agencies and records management system users.

Federal funding also points in the same direction. The Bureau of Justice Assistance opened a fiscal year 2025 grant program to help local agencies establish or expand crime gun intelligence centers.

State rules remain uneven

One challenge is that crime gun tracing rules differ across the country. Everytown Research says inconsistent state requirements can weaken tracing as a tool against gun trafficking.

Some states require law enforcement to trace recovered crime guns, while others do not. Kentucky has a trafficking or straw-purchasing law, but Everytown’s tracker says it does not require crime guns to be traced.

Privacy limits matter

ATF says eTrace is not a national gun registry or a storehouse of firearm sales information. The agency also says it can trace firearms only for law enforcement agencies involved in real criminal investigations.

That distinction matters as more police data moves through automated systems. Faster access may help investigators, but cities still need clear rules on access, auditing, retention, and public accountability.

Vendors gain bigger roles

The Louisville project also shows how private technology companies are becoming more involved in public safety infrastructure. A vendor-built interface can shape how quickly police records move into federal systems.

That can be useful when old workflows waste time. It also raises practical questions about procurement, data security, long-term costs, and what happens if a city changes vendors later.

Could a DOJ ruling change how Americans ship handguns across the country? Take a closer look at how USPS firearm mailing rules could shift, who may be affected, and why the decision is drawing attention from gun owners, dealers, and regulators.

Data still needs people

Technology cannot solve gun cases by itself. ATF says NIBIN works best when agencies collect evidence broadly, enter it quickly, follow up on leads, and use feedback to improve future submissions.

That means the tool’s real value depends on people. Detectives, forensic staff, prosecutors, and federal partners still have to act on the information after the system sends it back.

Could California’s gun laws reveal how one protest changed state politics for decades? Take a closer look at how the Black Panthers’ 1967 Capitol demonstration helped shape firearm restrictions, public safety debates, and the state’s modern gun control legacy.

Should more cities use firearm tracing tools to speed up gun crime investigations, or does that raise new oversight concerns? Share your thoughts on how police departments should balance public safety, privacy, and accountability.

This slideshow was made with AI assistance and human editing.

Read More From This Brand:

• Why serious racing fans skip Derby week and visit Churchill Downs in Louisville instead
• Louisville built an apocalypse bunker under the zoo, and you can actually go inside
• The scariest overnight stay in Kentucky is a crumbling TB ward on a Louisville hilltop