Jonathan Duncan understands that a perfect NCAA enforcement division won't catch every cheater in college sports. Two days after Big 12 Commissioner Bob Bowlsby called the NCAA enforcement system overwhelmed and ''broken,'' the NCAA's top cop fired back by defending his staff's work and acknowledging the impossible mission of policing more than 1,200 schools. The people who violate the rules will be found out and we will report them back to the committee on infractions.'' Duncan took over the enforcement division on an interim basis in March 2013 when the department was embroiled in its own embarrassing scandal. An internal investigation found the NCAA improperly collected evidence against the University of Miami, which led to the ouster of Julie Roe Lach.