The computer can be an instrument of crime, just like a gun or a bomb. Criminals can obliterate information and evidence contained in the computer with a single keystroke, thus complicating police investigative efforts. Police officers should immediately order suspects away from the computer to avoid losing valuable evidence. When possible, police officers should photograph the video display before the computer is turned off. Police officers should not immediately turn the power switch off to shut the computer down, primarily because the computer may be used to activate an explosive device. The computer should be processed for latent fingerprints using a lampblack or other conventional powder. When the computer has to be moved, care should be taken to disconnect it and transport it carefully. Both hardware and software should be examined in detail for possible evidence.