ISPs are "poorly placed to determine whether or not transfers of content are infringing or otherwise unlawful, a task generally reserved to attorneys, courts, and law enforcement," the groups said in a filing with the FCC. "In short, the issue raised by broadening the 'reasonable network management' exception to include copyright enforcement and the blocking of unlawful content is not whether ISPs may undertake these efforts, but rather whether they may inflict collateral damage on lawful traffic when they do so."