"If witnesses' pending visas are used against them in court, 'we go back to where we were before Congress created the U visa,' says Leslye Orloff, an attorney and vice president of Legal Momentum...who helped legislators craft the law. She says that means perpetrators may go unpunished: 'If defense attorneys make that decision [to mention the U visa in court], there may be more legislation needed to cut off their ability to do that.'"