At the Tyrell Building when first investigating Marcus Eisenduler's murder, outside his artificial gravity lab is a big computer terminal. Click on the terminal once, and McCoy will state how someone had repeatedly tried to access restricted DNA information files on the Tyrell Network. Do not click on the computer again -- if you do you will not be able to eventually enter his password and the computer will lock you out. Now, enter the Grav Lab and collect the clues there including the dog collar with the name: "Rikki". Go back to the terminal and click on it. McCoy will enter Eisenduller's dog name as a password, and you will able to get a copy of Tyrell's DNA information.