A former Northern Illinois University police officer has pleaded not guilty to raping a freshman girl in 2011. Similar charges against 25-year-old Andrew Rifkin were dropped last year after prosecutors found that police had not turned over statements that could have aided Rifkin's defense. He's accused of not stopping what he says was a consensual sexual encounter after the alleged victim told him to stop. Rifkin reportedly signed a statement admitting that he didn't stop, but his attorney says that's inconsistent with other statements he made and with the statements of other witnesses that were withheld during the initial prosecution.