Originally Posted by
knownothing
In the EU, (at least France) you are required to have a government issued ID card which states your what your disability is. Even if you are blind with a seeing eye dog, they often ask for it - esp if you go into a grocery store
This has nothing to do with grocery stores.
The requirements relating to disabilities are specific to commercial air carriers operating in and out of the EU (and USA).
What you have suggested is completely untrue for air travel and while you are free to show whatever you wish or to provide as much information as you wish, you need not.