Trusted Clay County DUI Lawyers

Your Future Deserves A Strong Defense

A reputation you can trust
Mark Sieron

Being charged with a crime in Clay County can upend your life overnight. From DUI arrests and drug charges to serious felony allegations, the stakes couldn’t be higher. With your reputation, your career, and your freedom on the line, you need a defense built on experience and results.

At Aguilar & Sieron, P.A., our Green Cove Springs criminal defense lawyers have spent more than 40 years standing up for people across Clay County, Jacksonville, and Northeast Florida. We know how the local courts operate, how prosecutors build their cases, and what it takes to dismantle them. Whether you’re facing a first-time DUI or a complex criminal charge, our attorneys are here to protect your rights and fight for your future.

Our law firm has earned a reputation in Northeast Florida for delivering results when it matters most. Attorney Mark Sieron brings decades of courtroom experience to every case, backed by a dedicated legal team committed to providing personal attention and clear guidance from start to finish. We treat every client with the respect they deserve and approach every case with the focus it demands. Because when your freedom is at stake, nothing matters more.

Mark Sieron
A reputation you can trust

Your Best Defense Is Our Experience

“Mark’s professionalism and genuine concern for his clients is insurmountable. He worked so hard on my case, and my outcome was significantly better than I could have hoped for. I owe this guy my life. I couldn’t help but cry and hug him when everything was said and done.”
– C.C.

Google Review

“Several years ago, I was in need of the best legal representation. My wife called the Florida Bar and scheduled a meeting with the president. She wanted to know who the best lawyer is we could find to represent us. The president told us that Mark Sieron is the best there is! After we contacted Mark, we quickly realized that the president was more than right!!”
– A.A.

Google Review

“I cannot say thank you enough to Mark! Mark and Kathy were available for any questions I had and gave me reassurance during my waiting period. If you’re looking for the best lawyer, look no further. You’d be lucky to have Mark represent you. Thank you so much!!”
– E.D.

Google Review
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Aggressive Representation When It Matters Most

For over 40 years, Aguilar & Sieron, P.A. has protected the rights of individuals and families across Clay County and Green Cove Springs. Founded by Attorney Mark Sieron, our firm is built on a commitment to integrity, preparation, and relentless advocacy for those accused of crimes.

Our team handles a full range of criminal defense matters, including DUI, drug charges, and other serious offenses, throughout Clay County, Jacksonville, and Northeast Florida. Each case receives the same level of attention and respect…because we understand that every client’s future depends on what happens next.

With decades of trial experience and a proven reputation among local judges and prosecutors, our firm has become a trusted name in Florida’s criminal defense community. Whether you’re navigating a first-time DUI charge or a high-stakes felony case, we focus on one goal: protecting your freedom and helping you move forward.

Aggressive Representation When It Matters Most

For over 40 years, Aguilar & Sieron, P.A. has protected the rights of individuals and families across Clay County and Green Cove Springs. Founded by Attorney Mark Sieron, our firm is built on a commitment to integrity, preparation, and relentless advocacy for those accused of crimes.

Our team handles a full range of criminal defense matters, including DUI, drug charges, and other serious offenses, throughout Clay County, Jacksonville, and Northeast Florida. Each case receives the same level of attention and respect…because we understand that every client’s future depends on what happens next.

With decades of trial experience and a proven reputation among local judges and prosecutors, our firm has become a trusted name in Florida’s criminal defense community. Whether you’re navigating a first-time DUI charge or a high-stakes felony case, we focus on one goal: protecting your freedom and helping you move forward.

Proven Defense Strategies for Florida’s Toughest Charges

Our Clay County criminal defense lawyers handle a wide range of state-level charges with skill and precision. From first-time DUIs to serious felony allegations, we know how to protect your future and limit the impact of an arrest.

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DUI Defense

A DUI charge in Florida can cost you your license, your job, and your reputation. Our team has decades of experience challenging police stops, field tests, and breath results to help clients avoid harsh penalties and protect their records.

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Drug Charges

Florida prosecutors pursue drug crimes aggressively, from possession to trafficking. We analyze every detail—search warrants, evidence handling, and officer conduct—to uncover weaknesses in the state’s case and fight for the best possible outcome.

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Criminal Defense

Whether you’re accused of assault, theft, domestic battery, or another serious offense, our criminal defense attorneys bring years of trial experience and local insight to your defense. We’re known throughout Clay County and Green Cove Springs for standing firm when the stakes are highest.

We Know Florida’s Fourth Judicial Circuit

Our attorneys have spent decades representing clients in Clay County Circuit Court and throughout Florida’s Fourth Judicial Circuit, which covers Clay, Duval, and Nassau counties. We know the judges, prosecutors, and court procedures that shape criminal cases in this region, which is knowledge that can make a real difference in your defense.

From DUI hearings and pretrial motions to complex felony trials, our team has appeared in nearly every courtroom across Green Cove Springs and Jacksonville. That local insight allows us to anticipate how the prosecution may approach your case and to build a defense strategy tailored to the realities of each courtroom.

Whether you live in Orange Park, Middleburg, Fleming Island, or downtown Jacksonville, we’re ready to protect your rights and help you move forward.

We Know Florida’s Fourth Judicial Circuit

Our attorneys have spent decades representing clients in Clay County Circuit Court and throughout Florida’s Fourth Judicial Circuit, which covers Clay, Duval, and Nassau counties. We know the judges, prosecutors, and court procedures that shape criminal cases in this region, which is knowledge that can make a real difference in your defense.

From DUI hearings and pretrial motions to complex felony trials, our team has appeared in nearly every courtroom across Green Cove Springs and Jacksonville. That local insight allows us to anticipate how the prosecution may approach your case and to build a defense strategy tailored to the realities of each courtroom.

Whether you live in Orange Park, Middleburg, Fleming Island, or downtown Jacksonville, we’re ready to protect your rights and help you move forward.

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FAQs About DUI and Criminal Charges

When you’re facing criminal charges in Clay County and throughout Northeast Florida, it’s normal to feel overwhelmed. Here are a few common questions people ask when they contact our Green Cove Springs law firm for help.

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What should I do after being arrested for DUI in Clay County?

Stay calm and exercise your right to remain silent. Contact a DUI lawyer as soon as possible to protect your license and build a strong defense. Time matters because there are strict legal deadlines that could affect your case.

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Can a DUI or drug charge be reduced or dismissed?

Yes. Depending on the evidence, arrest procedures, and your prior record, your attorney may be able to negotiate a reduced charge or challenge the case entirely. Every situation is different, but an experienced defense lawyer can identify potential opportunities to limit penalties or avoid conviction.

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Do I have to go to court for a misdemeanor charge?

In some cases, your attorney can appear on your behalf. This depends on the type of charge and the local court’s rules. Always check with your defense lawyer before missing a court date, as failure to appear can potentially make your situation worse.

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Will a criminal conviction stay on my record in Florida?

In Florida, most criminal convictions become part of your permanent record and can’t be removed through expungement or sealing. However, if your case is dismissed or you’re found not guilty, you may qualify to have your record cleared. Our firm can review your case and explain whether you’re eligible to seal or expunge your record.

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How much does it cost to hire a criminal defense attorney?

Legal fees vary depending on the complexity of the case. At Aguilar & Sieron, P.A., we’ll explain all costs upfront and help you understand your options before you make any decisions. Every client deserves clarity, and we’ll make sure you understand how fees relate to the work your case requires.

Your Freedom Matters. Take the First Step Towards Protecting It

If you’ve been charged with a DUI or another criminal offense in Clay County, Green Cove Springs, or the Jacksonville area, don’t wait to get the legal help you deserve. The sooner you speak with a defense attorney, the more options you have to defend your rights and protect your future.

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