If an application ask you to disclose your prior arrest, you have to disclose your prior arrest.
This answer is of a general nature and should not be relied upon as final, nor is it intended as legal advice. Consult with a qualified attorney before making any legal decisions. Gen Kimura, (832) 247-6932.
If it isn't in the FBI database it isn't likely to show when the immigration authorities run a background check. Remember though that you are still required to answer all their questions honestly and failure to do so may have negative consequences if you're caught. Contact the attorney that represented you and ask him/her the best way Tom,awfully answer any such question that you may be presented with.