on-board computer system in kirk's silver hyundai. pings the state said put the car near pam's office. the defense called it junk science. >> this type of expert testimony has never been allowed in the state of illinois before. it should not have been allowed in this case. >> but how could the defense answer for that gunshot residue found on kirk's gear shift? the defense expert agreed there was plenty of it on that spot, but -- >> finding that number of characteristic of residue particles is surprising. >> maybe too surprising? especially because there was none anywhere else in the car. so it looked like some kind of a mistake or -- >> you're suggesting that gunshot residue was purposefully placed on the lever or came into contact with either clothing, a