Today, two types of body scanners are used, The Millimeter Wave AIT scanner and the Backscatter X-ray AIT scanner. Each one generates an image of a person's body in order to detect any hidden material under their clothes. The Millimeter Wave AIT scanner produces images that resemble the negatives of a photo with fuzzy outlines and faces. This is done by using non-ionizing radio frequency energy to generate 3-dimensional images from the energy that is reflected from a person's body (tsa,2012). A Backscatter x-ray scanner uses low energy x-ray beams that produce a chalk like sketch of the body by scanning the surface of the body at a high speed (tsa,2012). They are placed at security checkpoints in the airport and in order for one to get to their gate; they must first enter the scanner. When they were first being used, only selected individuals were asked to step into the scanner. Nowadays, every person in line takes his or her turn in the scanner. Today, there are over 400 body scanners in over 70 airports nationwide that are continuing their efforts to keep us safe (Spencer,2010).