Now a technical expert who designs and makes such devices for the U.S. military and private industry tells Salon that he believes the bulge is indeed a transceiver designed to receive electronic signals and transmit them to a hidden earpiece lodged in Bush's ear canal.

"There's no question about it. It's a pretty obvious one -- larger than most because it probably has descrambling capability," said Alex Darbut, technical and business development vice president for Resistance Technology in Arden Hills, Minn. Darbut examined photographs of the president's back taken from the Fox News video feed at the first presidential debate in Coral Gables, Fla., as well as 2002 photos of the president driving and working in a T-shirt on his Crawford ranch, which were posted on the White House Web site.

He cheated, and still lost the debate.

Update (04-10-28): NASA physicist says imaging techniques prove the president's bulge was not caused by wrinkled clothing.

How can Nelson be certain there's some kind of mechanical device beneath Bush's jacket? It's all about light and shadows, he says. The angles at which the light in the studio hit Bush's jacket expose contours that fit no one's picture of human anatomy and wrinkled shirts. And Nelson compared the images to anatomy texts. He also experimented with wrinkling shirts in various configurations, wore them under his jacket under his bathroom light, and couldn't produce anything close to the Bush bulge.

"Look, he says, "I'm putting myself at risk for exposing this. But this is too important. It's not about my reputation. If they force me into an early retirement, it'll be worth it if the public knows about this. It's outrageous statements that I read that the president is wearing nothing under there. There's clearly something there."

How can Nelson be certain there's some kind of mechanical device beneath Bush's jacket? It's all about light and shadows, he says. The angles at which the light in the studio hit Bush's jacket expose contours that fit no one's picture of human anatomy and wrinkled shirts. And Nelson compared the images to anatomy texts. He also experimented with wrinkling shirts in various configurations, wore them under his jacket under his bathroom light, and couldn't produce anything close to the Bush bulge.

"Look, he says, "I'm putting myself at risk for exposing this. But this is too important. It's not about my reputation. If they force me into an early retirement, it'll be worth it if the public knows about this. It's outrageous statements that I read that the president is wearing nothing under there. There's clearly something there."