A firm of private eyes in the US have been digging the dirt on computer users – and finding all kinds of filth on their hard disk. One in four corporate computers contain some form of pornographic materials – including some instances of child pornography, according to Sudeep Bose, director of investigations at Digital Detective Services from Falls Church, Virgina. The results are not startling. Many small and medium-sized firms have no formal policies or standards on internet use or materials transmitted online. He said that employees with tainted materials on their computer are normally terminated immediately.