You know those scanners implemented by the TSA that can see through your clothing? They utilize terahertz (THz) radiation and it turns out that this could literally “unzip” the DNA molecule. And now they’re thinking of implementing the technology in mobile devices.
The device makes use of infrared light rays to image radiation that is coming from a person’s body. If the person is carrying a metal object such as a gun, it will prevent the rays from reaching the part of the body where the object is. This will result in the appearance of an outline of that object on the scanner.