My answer to this is a definite yes as they put this verbal warning and information into a database with your Passport and other identifying details (which is why you keep getting checked) so you should disclose it.
My initial thought is Part 9., Item 15.b. - Have you EVER been arrested, cited, detained or confined by any law enforcement officer, military official (in the U.S. or elsewhere), or immigration official for any reason, or been charged with a crime or offense?