The Rock County District Attorney has decided not to file criminal charges against three high school pranksters from Clinton. They gave their classmates brownies which had been laced with an herbal supplement last May. Five students became sick. The students had put the male enhancement supplement Zyrexin in the brownies as a senior prank and they could have been charged with a felony. D-A David O’Leary says he decided not to file the charges because the three didn’t intend to hurt anyone, they expressed sincere regret, apologized and agreed to pay for the victims’ medical bills.