Final answer:
Police use the program IDentikit to create facial composites of suspects using eyewitness descriptions. This helps in identifying and apprehending the suspects.
Step-by-step explanation:
The computer program that police agencies commonly use to generate a composite of a suspect is known as IDentikit. This tool allows law enforcement to create facial composites of suspects by combining various facial features such as eyes, noses, and mouths, which are selected from a database based on eyewitness descriptions. These composites can then be used to aid in the identification and capture of suspects.