The Bureau of Alcohol, Tobacco, Firearms and Explosives traced more than 211,000 guns back to their original point of purchase on behalf of law enforcement agencies in 2016. Of those, roughly 71 percent were originally sold in the state they were found, while the rest were from out of state. This interactive map shows the pattern of how guns move from state to state.

Expand chart
Note: Map shows only the top 10 out-of-state sources for traces run from each state; Data: Bureau of Alcohol, Tobacco, Firearms and Explosives; Chart: Chris Canipe

Why it matters: It's often impossible to establish the chain of ownership from owner to original point of sale. Firearms legally change hands without a paper trail through private purchases, including those made at gun shows. Additional restrictions on how records can be stored can make the entire chain even harder to trace.

Most ATF traces are run at the request of law enforcement agencies seeking information on guns recovered at crime scenes or confiscated during traffic stops. Not all recovered firearms are traced, but those that are can tell us a lot about how guns move between states. Here are some key takeaways from the data: Roughly 71 percent of guns traced by the ATF in 2016 originate in the same state in which they were confiscated. Washington, D.C. had the highest ratio of out-of-state traces at 96 percent. New Jersey and New York were the next highest, at 79 percent and 73 percent. States with stricter gun laws tend to have more traces originating in neighboring states. Illinois requires background checks for private sales and a 72-hour waiting periods for handgun purchases. Neighboring Indiana does not. Thirty percent of out-of-state guns in Illinois originated from Indiana. Go deeper: Gun Laws Stop At State Lines, But Guns Don't

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Two officers shot in Louisville amid Breonna Taylor protests

Police officers stand guard during a protest in Louisville, Kentucky. Photo: Ben Hendren/Anadolu Agency via Getty Images

Louisville Metro Police Department said two officers were shot downtown in the Kentucky city late Wednesday, just hours after a grand jury announced an indictment in the Breonna Taylor case.

Driving the news: Metrosafe, the city's emergency services, said it received reports of a shooting at South Brook St. and Broadway Ave., near the area where protests were taking place. A police spokesperson told a press briefing the injuries of both officers were not life-threatening. One officer was "alert and stable" and the other was undergoing surgery, he said.

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Biden: Breonna Taylor indictment "does not answer" call for justice

Former Vice President Joe Biden. Photo: Leigh Vogel/Getty Images

Former Vice President Joe Biden on Wednesday condemned the grand jury indictment of a Louisville police officer who entered Breonna Taylor's home in March in a botched drug raid that led to her death, saying in a statement the decision "does not answer" for equal justice.

The big picture: Biden called for reforms to address police use of force and no-knock warrants, while demanding a ban on chokeholds. He added that people "have a right to peacefully protest, but violence is never acceptable."

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