With Law & Order's Elisabeth Rohm leaving early next year to pursue a film career (buh-bye), exec producer Dick Wolf has narrowed down the search for a new assistant D.A. to five actresses. As reported in the current issue of TV Guide magazine, the finalists will be flown to New York later this week to shoot a full screen test with costar Sam Waterston and play hide-and-seek with S. Epatha Merkerson.