Alas the way Federal law is written Disney can't ask. Same with the Airlines and bring animals on board. Or how those with pet allugies are having problems everywhere due to the support animal claim issue in any public space including restaurants.
Almost all truly stricken with some sort of Disability would be willing to get some sort of documentation to show their true need for accomidation to cut down on the abuse.
Same with changing the California ridiculously loose issuance of Disability parking placards and plates along with lax enforcement. All this does is take away and hurt those truly in need. And I speak from experience as I need accommodation due to basically dying last year and ended up in a coma for a couple of weeks. Doing a lot better but still have issues some will never go away no matter how much rehab I go through.
I carry my DMV issued paper that comes with my placard and license plates. The document clearly says it must be carried with me at all times and presented if needed. I am guessing that is in case i park somewhere in a disabled space and a police officer decides to question my reason for parking there. I have heard of people being checked occasionally to make sure that the actual recipient is on board the vehicle and its not just a family member taking advantage of the system.
I ride the metrolink train and buy the disabled monthly ticket and never have been asked to verify by conductor except by one Los Angeles Sherriff. I have never looked into how the law works but you would think that if an officer of the law is allowed to verify disabled status then the same should be for anyone else where as a customer you are asking for disabled privileges. I think the limitation should go as to proving disability without asking what the disability is.
I tend to not use any of the disabled options in Disney parks. I just don't see then need especially since i can get a fastpass or go back on a less busy day.
The one time i did want to use it was when i was with another disabled friend and i was starting to have a rough time standing in one place for to long. with cane in hand i walked up to the booth on the now Pixar Pier and asked what my options where.
-CM - well DCA attractions are all designed with wide queues that can handle wheel chairs. Of course I mentioned to her that i didn't have a wheel chair.
-CM - she asked "what limits you from standing in line".
-i wasn't sure how to answer that so i asked, Are you asking me what my disability is? I don't mind telling you but that is not something you should be asking.
-CM - I never asked you that i know better because i am professionally trained to handle these situations.
At that point i had no idea what she was asking so i asked again
-ME - so what do you mean by what limits me from standing in line other than me telling you that i am a registered disabled person for life?
-CM - yes i understand but why are you limited to stand in line?
I swear it was the most awkward thing so i just straight out and told her,
-ME - the fact that I have necrosis of the hip and leg.
-CM - sir i didn't ask what your disability is just what limits you from standing in long lines.
At that point I said thank you and walked away, just standing there going back and forth was started to get to me. Went to the nearest bar and had a drink.
so from that experience it seemed like unless i was in a wheelchair then they become skeptical of believing guests whether they are disabled or not. not necessarily a bad thing but it creates an awkward and what could be confrontational situation. If i was an a.. hole i could have easily created an issue with guest relations or more.
allowing business to ask for a disable card or DMV issued paper should be the norm and best way to control these situations.