I wonder who the fraud was.
http://www.huffingtonpost.com/2013/08/05/fake-service-dog-certificates_n_3709720.html
I know several people who have done this, generally to have their "companion" pets in rental housing where it is otherwise not permitted, or to travel with their pets.
My understanding is that airlines are not permitted under federal law to ask to see any certification for service animals.
Undoubtedly many unfortunate people need true service animals, but the odds are in this case both parties were not fully truthful.