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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

A Sandusky, Ohio, man was taken to a hospital Wednesday after crashing a car into a bus shelter when he spotted a spider in his car.The 21-year-old man was driving a 2003 Cadillac CTS when he saw the bug, hit a curb and drove through a bus stop shelter on the side of the road, Sandusky police said. The man reentered the road and stopped shortly thereafter.The man was taken to Firelands Regional Medical Center with minor injuries, authorities said. It's not known if the spider sustained any injuries. Knowing spiders, probably not.The man was cited for failure to control, according to police. 609

American rock climber Brad Gobright has died after a fall in northern Mexico.The incident happened Wednesday at Sendero Luminoso in El Potrero Chico, the nation's civil protection agency said. Gobright, 31, of Orange County, California, was with a climbing partner when he fell nearly 985 feet.Rescuers retrieved his body Thursday and treated his climbing partner, Aidan Jacobson, for injuries to his ankle and other parts of his body.A fellow climber and a friend of the partner said Jacobson told him their rope got stuck, causing them to both fall 20-30 feet to the ledge below.Jacobson crashed into a bush, which broke his fall and stopped him from tumbling farther. "It pretty much saved his life," the friend, Ryan Borys, said. Jacobson told him he saw Gobright fall past him and over the ledge.The State Department confirmed Gobright's death in Mexico. "We offer our sincerest condolences to his family on their loss. We are closely monitoring local authorities' investigation and are providing all appropriate consular assistance. Out of respect to the family during this difficult time, we have no further comment," it said.Famed climber Alex Honnold, who was featured in the film "Free Solo," 1215

A vast collection of data on Facebook users was exposed to the public until recently on Amazon's cloud computing service, researchers have found.UpGuard, a cybersecurity firm, 188

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