the same type used in sally weiner's murder. >> i think that would be extremely unusual to have glaser round ammunition in a person's home. >> and local authorities asked the fbi to conduct their own analysis of kopenheffer's computers after the initial search of the hard drives turned up nothing. a document is not all in one place on a disc drive. pieces of it are stored in different sectors of a drive. when a document is deleted, it's not erased from the hard drive. instead, the space occupied by that document is labelled available to reuse if necessary. >> by going through that disc mathematically, finding the proper clusters based upon the known interleaving of the drive, you can piece together an entire document if the file space that that document occupied had not been overwritten. >> when this crime was committed in 1988, there were no computer programs that could reassemble