""However if your still a bit paranoid, There is one thing Infa-Red cant see through.. Lead!"" -the_camel" Thermographic cameras, sometimes called a FLIR (Forward Looking InfraRed) don't "see through" anything, they read the infrared radiation from the object. Generally speaking, the higher an object's temperature is, the more infrared radiation it emits. The exception is highly reflective materials, they are harder to read and give false readings. Please do research before you post, bad info like that could get someone in trouble.