Cop dogs made from rescued shelter dogs.
 

From Shelter to K9 Unit: Group Gives Dogs Second Chance and a Duty - ABC News

I loved this story that was on last night July 7, 2014 on ABC World News with Diane Sawyer. It is about a dog trainer who gets rescues from shelters and trains them as police canine. These are mostly mutts who are given a chance at a happy home while they do meaningful work.