Sargent

-blood is black, turns white when threatened
-can mimic siren noises
-does have teeth, head opens up and stretches, eye at back of throat
-blue and red parts glow and can switch places
-red and blue spots show criminal activity in an area, like a map, red being major and blue being minor
-police tape is produced from it's front arms
-can go wee woo real good

member of a species that has been specially bred/created/modified to perform specific tasks, sarge is a sub breed that serves to assist law enforcement.