Just wondering, and I really don't think so, but something happened to me today that was just too coincidental to ignore. My wife and I went shopping at a local Walmart, and I was carrying in my Thunderwear Holster, as I frequently do. Upon entry to the store, their "magnetic security" device alarmed. As it happened, someone else had been exiting the store and crossed through the device about the same time I was entering. He was stopped, but was only carrying dry goods. The wife and I went about our business of shopping, and I didn't think much else of it. When we finished shopping and exited the store (we had mainly groceries and school supplies.....nothing metallic at all, no clothing that would have had magnetic sensors, etc.), the alarm went off again. Someone else was exiting the store just behind me, and after they checked both of us, he was only carrying dry goods as well, so it was difficult to determine whether it was me or him that set it off. My point is, I always thought that those types of things were purely magnetic sensors that picked up a signal from a magnetized tag on merchandise. There are no signs posted stating that weapons are not allowed, etc., but I'm wondering if Walmart has set up their sensors as metal detectors? Any thoughts?