The Consumer Financial Protection Bureau, as required by the Dodd-Frank Act, can use the new "abusive" standard to prohibit certain financial acts and practices. Bank executives and agency officials, however, are struggling to explain exactly what the abusive standard means. "I've always said it's like pornography: I'll know it when I see it," said Jeffrey Taft, a partner with Mayer Brown. "It's hard for you to define it. I think it will be virtually impossible for the bureau to really come out with concrete guidelines."