The district attorney sends for the officers who have worked upon the case and for the captain or inspector who has directed their efforts, takes all the papers and tabulates all their information.

His practiced eye shows him at once that a large part is valueless, much is contradictory, and all needs careful elaboration.

A winnowing process occurs then and there; and the officers probably receive a "special detail" from headquarters and thereafter take their orders from the prosecutor himself.

The detective bureau is called in and arrangements made for the running down of particular clues.

Then he will take off his coat, clear his desk, and get down to work.
Of course, his first step is to get all the information he can as to the actual facts surrounding the crime itself.