Leesburg Criminal Defense Lawyer

Delivering Great Leesburg DUI / DWI Defense

Virginia DUI law can be merciless, and a DUI or DWI conviction in Leesburg may mean license suspension, substantial fines, possible jail time, mandatory ignition interlock, or long-term damage and unwanted consequences to the defendant’s personal and professional life. Leesburg is home to a large professional community, with residents who hold security clearances, professional licenses, and careers that a DUI conviction can dismantle overnight. Jon understands those stakes and defends every case accordingly.

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. Jon Katz combines his extensive trial ability and persuasive skills in every DUI case he handles. He knows the traps and assumptions built into these prosecutions and how to dismantle them. Jon challenges whether the traffic stop was lawful in the first place, whether field sobriety tests were properly administered under standardized protocols, and whether breath or blood results are accurate, reliable, and constitutionally obtained.

If a plea offer isn’t in your best interest, Jon doesn’t hesitate to take your DUI case to trial and fight for an acquittal. His trial readiness is not a bluff—it is the foundation of every negotiation he enters on your behalf.

Drug Charge Defense in Leesburg and Loudoun County

Drug arrests can have long-term consequences for your freedom, your job, and your immigration status. Loudoun County drug charges range from simple possession of prescription drugs to allegations of heroin or fentanyl trafficking. Jon Katz defends people in Leesburg and across Loudoun 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. He also challenges whether the prosecution can establish that you had actual knowledge, dominion, or control over the alleged contraband. Whether you are facing a misdemeanor possession charge or a serious felony distribution allegation, Jon pursues your best possible defense with the same relentless intensity.

Leesburg Assault and Violent Crime Defense

When you're accused of assault or a violent offense, the person who initiated the confrontation is not always the one facing charges. Jon Katz works to uncover what actually happened: whether self-defense, mutual combat, or defense of others applies, whether the complaining witness has credibility issues or a reason to embellish, and what the full evidence record genuinely shows. Every assault defense Jon builds is trial-ready, aimed squarely at challenging the allegations at their foundation and pursuing every essential defense to quash a conviction.

Jon Katz works to uncover the full picture: who initiated contact, what the physical evidence actually shows, whether the complaining witness has credibility issues or a motive to fabricate, and whether self-defense, defense of others, or mutual combat applies to your situation. In domestic assault cases, where charges often hinge entirely on one person’s account, Jon presents your side of the story in a way that is compelling to a Loudoun County judge or jury. He builds every assault defense with trial in mind and will not allow prosecutorial momentum to substitute for proof.

Firearms and Weapons Defense in Leesburg

Virginia imposes serious penalties for weapons offenses, and the consequences of a conviction can be severe and long-lasting. A committed advocate for 2nd Amendment rights, Jon has personal experience handling and firing weapons, and he brings that firsthand familiarity to bear when speaking sensibly on behalf of his clients. He challenges the search and seizure of any weapon found on or near a defendant, contests knowing possession, and argues every lawful-use defense available under Virginia law.

Jon defends clients charged with unlawful carrying of a concealed weapon, possession of a firearm by a felon, and weapons charges that arise in connection with DUI or drug allegations. He challenges whether law enforcement had any legal basis to conduct the search that produced the weapon, contests whether the prosecution can establish knowing possession, and argues every available lawful-use defense with force and precision.