However, those lists are treated with extreme discretion because they include the identities of officers on undercover assignments. (law.stackexchange.com)
Evidently, these young FBI geniuses were just on a collective undercover assignment to infiltrate the Melrose Avenue club scene, because their disguise consists of half - grown (or half - ungrown) beards, shaggy hair, [and] insouciant wisecracking attitudes. (rottentomatoes.com)
I would enjoy following a character like Will through several undercover assignments, such as with the Jason Bourne books. (bookbrowse.com)