Sketches generate leads when there isn't anything else to go on

If you don't have evidence, if you don't have good leads, you have to do something,” he said. “You have to generate some leads. That's something they can do to develop some leads.”

Greenville police Cpl. Tyler Propst said that while no one at the department could recall a sketch breaking a case, officers consider them effective in generating leads.

“In a crime of great severity, sometimes any and all leads can be very valuable,” Propst said

Suspect sketches will generate leads, but many are dead ends
Greenville News - Greenville,SC,USA
By Paul Alongi • Staff writer • July 20, 2009 The police sketch of Cherokee County's serial killer bore little resemblance to the mug shot of Patrick Tracy ...