Take it as proof of how pervasive compliance monitors have become in corporate criminal settlements: They now come with their own guidelines, in the form of a Justice Department memo.

Craig Morford, acting deputy attorney general until last month, issued the guidelines on selection of compliance monitors March 7. The rules come amid concerns over transparency and possible conflicts of interest in the selection of monitors. The issue came into sharp relief last year when Christopher Christie, the U.S. attorney for New Jersey, approved a $52 million contract for his former boss (and former Attorney General) John Ashcroft to be compliance ...