Trusted Clay County DUI Lawyers
Your Future Deserves A Strong Defense
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.
Your Best Defense Is Our Experience





“I owe this guy my life.”
“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.






“The best there is.”
“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.






“You’d be lucky to have Mark represent you.”
“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.


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.

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.

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.

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.

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.

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.

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.

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.

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.

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.
Experience
matters.
Results
matter.
Your
rights matter.
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.
Contact Aguilar & Sieron, P.A. today for a free, confidential consultation. We’re available 24 hours a day, 7 days a week, and located directly across from the Clay County Courthouse and Jail in Green Cove Springs. We proudly serve clients in Clay County, St. Johns County, Jacksonville, and communities throughout Northeast Florida.







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