Clark smiled as if I'd served up a fat curve with the bases loaded. "We use a simple, helmetlike device that flashes ultraviolet signals in through the player's eyes. His scalp, facial, and ear muscles react in accordance with the pattern sent to them, as it is interpreted by the statsoft. We read the electronic activity of those muscles and match them against the expected response. If there is a variation from the expected response, we test futher. If the statsoft is bad, we lock the player up with a coded message, then pull the software he's loaded. That's verified and if it's been tampered with, the player is out and the team dealt with if the modifications have enhanced the player at all and they are to blame."