Just found this article which may have bearing on your question:
Update on DUI Reporting Requirements
As part of its regular outreach to the aviation community, FAA’s Security and Investigations Division is providing clarifications to a regulation on reporting requirements related to alcohol- and drug-related motor vehicle actions (MVA). The division offers the following information to provide a greater understanding of the reporting requirements as defined by Title 14 Code of Federal Regulations (14 CFR) section 61.15:
An airman has two separate reporting requirements involving alcohol-related MVAs: one report made in accordance with 14 CFR section 61.15(e), and another made to the pilot’s Aviation Medical Examiner (AME) via Application for Airman Medical (FAA Form 8500-8).
What is reportable under 14 CFR 61.15(e)? Alcohol-related motor vehicle actions, such as suspensions, revocations (administrative actions), and convictions for offenses, such as driving while under the influence, driving while impaired, and operating under the influence. Please note suspensions/revocations and convictions are both reportable under this regulation even though they may be related to the same incident. These reports must be sent to the FAA’s Civil Aviation Security Division, P.O. Box 25810, Oklahoma City, OK 73125, within 60 days of an alcohol-related MVA.
What is reportable on your application for Airman Medical, specifically question 18v? (1) Any arrest and conviction involving driving while intoxicated/under the influence/while impaired, etc; (2) any conviction or administrative action which resulted in the denial, suspension, cancellation, or revocation of your driving privilege (Note: this is not limited to alcohol-related events); and (3) any attendance at an educational or rehabilitation program. Please remember to openly discuss details related to these events, along with any other information asked on the form, with your AME.
To address other concerns, please refer to www. faa.gov/go/duidwi or call (405) 954-4848