Could images from red-light cameras have led Seattle police to a pair of killers? The ubiquitous cameras are mounted a short distance from the Pioneer Square intersection where Nicole Westbrook, 21, was fatally shot in April by a gunman in a passing car. Other cameras are in the Central Area, not too far from where Justin Ferrari, 43, was killed while driving with his family about a month later. Detectives wonder if the cameras may have captured images - a fleeing car or a gunman's clothing, for example - that could have helped investigators. But police are barred by state law from accessing and using images from the controversial cameras for anything other than traffic enforcement. Still, the knowledge that the cameras could provide vital clues in the unsolved slayings is equal parts tantalizing and frustrating for detectives. Washington is among the few states that bar police from using images from red-light cameras in criminal investigations. The way the 2005 law is tailored, even if a homicide, abduction or any other serious crime occurs within full view of the cameras, the images cannot be used by police, said King County Senior Deputy Prosecutor Don Raz.