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A subtle design feature of the AR-15 rifle has raised a technical legal question that is derailing cases against people who are charged with illegally buying and selling the gun’s parts or building the weapon.At issue is whether a key piece of one of America’s most popular firearms meets the definition of a gun that prosecutors have long relied on.For decades, the federal government has treated a mechanism called the lower receiver as the essential piece of the semiautomatic rifle, which has been used in some of the nation’s deadliest mass shootings. Prosecutors regularly bring charges based on that specific part.But some defense attorneys have recently argued that the part alone does not meet the definition in the law. Federal law enforcement officials, who have long been concerned about the discrepancy, are increasingly worried that it could hinder some criminal prosecutions and undermine firearms regulations nationwide.“Now the cat is out of the bag, so I think you’ll see more of this going on,” said Stephen Halbrook, an attorney who has written books on gun law and history. “Basically, the government has gotten away with this for a long time.”Cases involving lower receivers represent a small fraction of the thousands of federal gun charges filed each year. But the loophole has allowed some people accused of illegally selling or possessing the parts, including convicted felons, to escape prosecution. The issue also complicates efforts to address so-called ghost guns, which are largely untraceable because they are assembled from parts.Since 2016, at least five defendants have challenged the government and succeeded in getting some charges dropped, avoiding prison or seeing their cases dismissed entirely. Three judges have rejected the government’s interpretation of the law, despite dire warnings from prosecutors.Federal 1866

An agent with the US Border Patrol in Arizona is accused of sexually assaulting multiple women, the Tucson Police Department said Wednesday.Steven Charles Holmes was placed on administrative duties pending the outcome of the investigation, a US Customs and Border Protection spokesperson said.Holmes, 33, was arrested Tuesday and arraigned on three counts of sexual assault and three counts of aggravated assault, police said.CNN has reached out to the Pima County Attorney's office to determine if Holmes has an attorney.Police said a woman told investigators Holmes sexually assaulted her on a date after meeting him through a dating app. Holmes told her he was a Border Patrol agent, police said.Holmes was on several dating apps, Tucson Police Sgt. Pete Dugan said. Police uncovered "multiple victims with similar reports occurring from January 2012 to January 2019."Holmes has seven years of service with the US Border Patrol, the agency said."The U.S. Border Patrol stresses honor and integrity in every aspect of its mission, the agency said in a statement."We do not tolerate misconduct on, or off duty, and will fully cooperate with all investigations of alleged misconduct by our personnel." 1213

An American Airlines pilot based out of Dallas-Fort Worth has tested positive for coronavirus, according to a statement from the airline obtained by ABC News. American Airline said the Chief Medical Officer and leaders from the pilots' office have been in touch with the pilot. The airline said they are in close contact with the Centers for Disease Control and Prevention (CDC) and public health officials and are coordinating with them on all required health and safety measures. Full statement: 509

About 130,464 pounds of raw ground beef products have been recalled because they may contain plastic, the US Department of Agriculture's Food Safety and Inspection Service (FSIS) announced Thursday.The products subject to the recall are 16-oz vacuum sealed packages of "Nature's Rancher 100% Grass Fed Organic Ground Beef 85% Lean, 15% Fat" and "Nature's Rancher 100% Grass Fed Organic Ground Beef 93% Lean, 7% Fat," the USDA said.These products, recalled by Rastelli Foods Group, have use or freeze by dates of 10/24/19, 10/31/19, 11/04/19, 11/07/19, and 11/11/19.The products were sent to distribution centers and then retail locations in Colorado, Connecticut, Georgia, Illinois and Maryland.The recall was initiated by customer complaints, though there have been no confirmed adverse reactions from the products, the USDA said.The USDA said consumers who have purchased the beef should not consume it, and anyone concerned about illness should contact a healthcare provider. 990

A Virginia doctor was gunned down with his tour guide while on vacation in Belize, according to local authorities.Gary Swank was visiting the Central American country with his family. He had been on a fishing boat with local guide Mario Graniel when they were both shot dead, Belize Police Commissioner Chester Williams said in a press conference Monday recorded by the San Pedro Sun newspaper.In the recording, Williams said the tour guide had a disagreement with a local gang kingpin, and agrees that Swank was a "victim of circumstance."Graniel had earlier reported to police that someone fired shots at his home on Friday, but he never filed a formal complaint, Williams said."We maintain police presence in the area to protect him and the community from further shootings but we can't follow the man everywhere he goes," he said. "He decided to go out with a tourist.""We did what we could have done in terms of detaining those who we believe were responsible and maintaining presence in the area where he lived."CNN has reached out to Belize authorities, but has not heard back.Swank was 'a well-respected and well-loved colleague'Swank was the medical director of Carilion Clinic cardiac catheterization lab and an associate professor of internal medicine at the Virginia Tech Carilion School of Medicine, according to a statement from the clinic. The school is in Roanoke, Virginia, about 170 miles west of Richmond."Dr. Swank was a well-respected and well-loved colleague who, each and every day, embodied the values that we hold dear," the statement reads. "His absence leaves a void in our team and in our community."Swank's patients were devastated to hear of his death."He saved my life, and every time I went to his office he was a very knowledgeable, patient and caring person," Teresa Hodges, who was Swank's patient for 13 years, told 1864