An important benefit of the switch to all-digital broadcasting is that parts of the valuable broadcast spectrum have been freed up for public safety communications by groups such as police, fire departments and rescue squads.Also, some of the spectrum has been auctioned to companies that will be able to provide consumers with advanced wireless services, such as wireless broadband.The Department of Homeland Security is requesting million to invest in detection systems, which includes funding for the backscatter machines, which cost between 0,000 and 0,000 each.The backscatter machines use high-energy X-rays that are more likely to scatter than penetrate materials as compared to lower-energy X-rays used in medical applications.Security experts have described whole body scanners as the equivalent of "a physically invasive strip-search." The Transportation Security Administration operates the body scanner devices at airports throughout the United States.On July 2, 2010, EPIC filed a petition for review and motion for an emergency stay, urging the District of Columbia Court of Appeals to suspend the Transportation Security Administration's (TSA) full body scanner program.Although this type of X-ray is said to be harmless, it can move through other materials, such as clothing.When being screened, a passenger is scanned by high-energy X-ray beam moving rapidly over her body.
DTV enables broadcasters to offer television with better picture and sound quality, and multiple channels of programming.
The image resolution of the technology is high, so the picture of the body presented to screeners is detailed enough to show genitalia.
These images are not necessarily temporary - screeners can save the body images to the system's hard disk or floppy disk for subsequent viewing on either "the system monitor or on any IBM compatible personal computer with color graphics." The Transportation Security Administration claims that is not storing detailed images of passengers screened by the system.
Airport security has undergone significant changes since the terrorist attacks of Sept. Recently, the Transportation Security Administration (TSA) announced a proposal to purchase and deploy "Whole Body Imaging" X-ray machines to search air travelers at all airports.
TSA said it believes that use of the machines is less invasive than pat-down searches.