They're widely used as work dogs, including for drug detection and as guide dogs. (woofwhiskers.com)
The history of dog detection regulations has been somewhat controversial, but there are organizations which create certification to ensure highest quality drug detection training. (animalwised.com)
Labs love to please, and they love to work — which makes them desirable as guide dogs, search and rescue dogs, drug detection dogs, and therapy dogs. (dogcare.dailypuppy.com)