The Download: the Pentagon's AI-powered lie detector and young organ limits Plus: ChatGPT helped the Tumbler Ridge shooter focus on attack tactics. The US government wants to spend $30.3 million over the next five years on an improved lie detector, according to a Department of Defense budget request. The program, called "Polygraph+" or "Polygraph Next," will focus on scoring algorithms that use AI and machine learning, as well as a technique called "standoff sensing," which can take physiological readings from a person without attaching a device to them. The project aims to improve the accuracy and reliability of polygraph assessments. But it could just be the latest in a long line of failed attempts to use technology to detect lies. Here's how the program could work--and why experts say AI-enabled lie detection is "the worst of both worlds."

Phil Houston knows how to spot a lie. A former career CIA officer who's sometimes been called the human lie detector, he literally wrote the book on detecting deception. His techniques are used by U.S. intelligence agencies, businesses and billionaires. Now he's seeking to harness the power of artificial intelligence to supercharge his system -- and market it to hedge funds listening to earnings calls, investigators interviewing suspects, employers considering potential new hires, or anyone else trying to discover duplicity. There's been a long history of hype around technologies that promised to turn lie detection from an art to a science, only to see the techniques fall far short.