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Jonathan L. Katz

Pursuing your best defense since 1991 against DUI, felony and misdemeanor prosecutions. Always fully prepared for trial and court battle.

Jon Katz, P.C.

10509 Judicial Drive
Suite 101
Fairfax, VA 22030

Phone: 703-383-1100

Website: katzjustice.com/

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About Jonathan L. Katz

Since 1991, practicing DWI/DUI defense and criminal defense. Pursuing innovative approaches at trial and beyond to obtain as much success as possible. Top-rated by key lawyer reviewers AVVO (10/10) and Martindale-Hubbell (AV/ 5/5). Based in Fairfax, Virginia, and practicing in Northern Virginia and beyond.

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Virtual Forensic Library

NCDD members have access to a comprehensive forensic library that provides invaluable information to be used when defending clients charged with DUI.

This library includes scientific articles on drug and alcohol intoxication, toxicology and pharmacology, methods of testing for blood alcohol content, field sobriety testing, potential errors that may occur during testing, accident reconstruction, expert testimony, and evidentiary rules. This valuable information can ensure that you provide a high quality defense to clients charged with DUI based on the circumstances of their case and the laws in their state.

Virtual Forensic Library

FROM OUR BLOG

Interview With an Amicus

06/27/2025

Written by Michelle L. Behan Amicus Curiae (Latin for "Friend of the Court") refers to a brief that is filed by an interested, non-party to the matter under consideration. This is often done in cases where organizations and entities wish to provide the reviewing court with their point of view, be it social or public policy implications, or special interest agendas....

Keeping FSTs Out of a Trial

04/23/2025

Written by Neil Halttunen I want to address a common issue that DWI practitioners are facing, trying to keep FSTs out of a trial. One way is to take the position that FSTs are scientific evidence and make the prosecutor lay scientific foundation which they rarely can do. The HGN test was the result of several studies. See Generally Session 8 of...

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NCDD Member

Benefits of NCDD Membership

Members of the NCDD not only demonstrate that they are qualified DUI defense attorneys, but they have access to valuable information and resources. We provide access to documentation blood alcohol testing devices and scientific articles related to alcohol, drugs, driving, and testing.

We offer training on trial techniques and scientific testing, and we provide access to experts and a comprehensive knowledge base of cases and motions. With all of these resources at your fingertips, you will be able to win more cases

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Membership Plans

Depending on your level of experience, we offer multiple plans for NCDD Membership. Attorneys who have been practicing for less than six years are eligible for a New Attorney membership, while those who have been practicing for over six years can receive a Seasoned Attorney membership. We also offer memberships for Public Defenders.