I think part of the problem is there are many who are taking advantage so they can take their fake service animal everywhere with them.
Anyone can buy a service dog vest on Amazon and there are stores on eBay and such selling fake certificates and licensees .
With one of these they can bring their fur baby everywhere with them.
And yes not all real service animals can be identified easily I have a friend with one that alerts her if she is going to have a seizure. I wish I could tall how it does that. She has run into people questioning her bringing it into places before too,
I'm not going to confront someone even if I feel they are not real but there are those that do. Probably the same people who make places with deed restrictions something I would never consider buying into.