The answer is, "You may not ask me that question". If you really want to gild the lily you can say, "I am sorry but my answering that question would mean that I helped you violate the ADA and I do not want to get you into legal trouble."
Of course talking to the police in the first place is a no no.
There are only five things you can say to the police.
1.)Am I free to leave? (if they say yes then leave)
2.) Am I under arrest? (If the answer is no then ask the first question.)
3.) Do you have a warrant?
4.) May I see the warrant?
5.) I wish to consult with my attorney before answering any questions.
6.) No comment.
Ok maybe seven things.
What’s number 7?