This new system of identifying criminals looks at individual facial features.
“The whole system of the ‘portrait parler’ is a process of elimination,” explained Capt. Faurot. “It is on that basis we are to reorganize the Rogues’ Gallery. We will be able to divide the number of portraits to be searched on a given case by three if we know the type of nose, by two again if we know the height, by three if we know the type of ear, and so on till we have only a small, narrow group to examine.”
I imagine identifying a criminal in the portrait parler is something like playing Guess Who?
NEW IDENTIFICATION SYSTEM OUSTS ROGUES’ GALLERY: Capt. Joseph A. Faurot After Studying the “Portrait Parler” Abroad Will Introduce It in New York’s Detective Department and Promises Great Results. (PDF)
From September 10, 1911