Vienna Criminal Defense Lawyer

Delivering Great Vienna DUI / DWI Defense

Virginia DUI law can be harsh, and Vienna prosecutors are not pushovers with settlement negotiations. For Vienna residents, the consequences of a DUI conviction extend well beyond the criminal law arena.  A conviction can trigger a security clearance review, complicate professional licensing, and wreak long-term damage and unwanted consequences on the defendant’s personal and professional life.

As a member of the National College for DUI Defense, Jon Katz has been trained by one of the nation’s top police instructors in field sobriety testing. He has worked with defense forensic experts in over 100 cases. He combines that technical foundation with his extensive trial ability and persuasive skills in every DUI defense he handles. Jon knows the traps and assumptions built into these prosecutions and how to dismantle them. He tirelessly attacks police stops, field testing, Constitutional infirmities, arrests, breath and blood testing, and the entire prosecution against you— because a multitude of defensive attacks are often necessary in pursuing your best defense. If plea negotiations are not to your liking, Jon doesn’t hesitate to take your DUI case to trial and fight for an acquittal.

Drug Crime Defense for Vienna Residents

Drug arrests can have long-term consequences for your freedom, career, security clearance, and immigration status. For Vienna defendants, a powerfully persuasive defense is essential from day one. Jon Katz defends people in Vienna and Fairfax County accused of drug crimes by challenging searches and seizures, scrutinizing government chemist reports and testimony, addressing innocent reasons for being near contraband, and attacking dragnet arrests.

Jon leaves no stone unturned when it comes to drug evidence. He evaluates the integrity of the laboratory analysis, investigates the use of informants or drug dogs, and fights to exclude evidence obtained through constitutional violations. The government’s case frequently depends on evidence that looks airtight until it is put under a microscope, and Jon brings that scrutiny to every piece of drug evidence in the file.

Assault and Violent Crime Defense

Assault and violent offense charges are often built on a single account of events — one that may be incomplete, exaggerated, or filtered through the lens of someone with their own agenda. Jon Katz takes nothing in the police report at face value. His defense begins with a rigorous challenge to the accuracy of the allegations, the development of the full factual record, and the pursuit of every essential defense available to defeat a possible assault conviction. Full trial readiness is not optional in these cases — it is what forces the prosecution to confront the real weaknesses in its evidence.

For Vienna residents, an assault conviction carries reputational consequences and career risks that nobody wants to be saddled with. Jon builds your assault defense for the best avenues to acquittal, doing so tirelessly and fearlessly.

Firearms and Weapons Defense in Fairfax County

Virginia imposes serious penalties for weapons offenses, and the consequences of a conviction can be severe and long-lasting. Jon is a strong advocate for 2nd Amendment rights to possess and use firearms and other weapons. He is experienced in firing numerous handguns and rifles, and brings that firsthand familiarity to bear when pursuing his clients' best defense.

Jon challenges the search and seizure of any weapon found on or near a defendant, contests knowing possession where the facts support it, and pursues every lawful possession defense available under Virginia law. In Fairfax County, weapons charges frequently arise from circumstances where law-abiding gun owners find themselves in a prosecutorial jam, and Jon is particularly well-suited for persuasively presenting your defense to judges and jurors.