We went two weeks ago. DS has an annual pass and we went to the AP office with his pass, a note from his Dr, dated last month and the previous pass along with a pass from WDW. In addition I brought my blue handicap tag for the car.
I was told the letter was fine and the tag is proof enough for me. DS was issued a pass good for one year.
At the ride they would ask for us to take out the pass so they could see both sides and we kept his AP and pass in a clear waterproof pouch on a lanyard.
They do check better at the rides but there was not a problem getting the pass because we had all the proper documentation.
For the rest of the thread, don't get me started. I would gladly wait 100 days, for 100 hours, to take away all the issues that go with autism. Life isn't always fair but we deal with what we were given and are grateful. The access pass helps us make the park available to our son. People that don't live with it don't know.