Attorney John Drennan

Drennan Law Firm LLC

Drunk Driving Attorney | Serving Mount Pleasant, SC

Free Consultation

1350 Chuck Dawley Blvd.
Mount Pleasant, SC 29464

Exceptional Knowledge and Extraordinary Results. We Fight to Win! 
Call Us Now to Discuss Your Legal Options

Bad things do happen to good people. When you are injured by someone else in an accident or just because you were arrested on suspicion of drinking and driving, committing a drug crime or other criminal act, it doesn't mean that you have to just let the the situation have its way with you. An experienced personal injury, criminal defense and DUI attorney can protect your rights and freedoms.

In the case of a criminal complaint, the evidence against you might be strong, but does it prove beyond a reasonable doubt that you are guilty? Prosecutors almost always overcharge and under deliver on the proof, in the hopes that you won't get a good lawyer. The charges you face can be greatly reduced with the right defense lawyer in your corner.

When you've been injured through no fault of your own you may have the right to a financial settlement that recovers all of your costs including property, medical and pain and suffering. It is important to talk to a lawyer and let your lawyer talk to the insurance company's adjusters who do not have your best interests at heart.

Contact us today if you need legal assistance with any of the following:

  • Drunk Driving Defense (DUI / DWI)
    • Drunk Driving Record Expungement
  • Criminal Defense
    • Assault
    • Drug Violations
  • Personal Injury
    • Vehicle Accidents
    • Pedestrian Accidents
    • Slip and Fall
    • Animal Bites

We defend hundreds of DUI, criminal and personal injury cases in Charleston and Mt. Pleasant every year. Stop worrying and get your your rights protected today.

Call Attorney John Drennan today at 843-619-0129 to arrange your free initial consultation.

Attorney Profile

Attorney John L. Drennan


  • South Carolina
  • United States District Court

Admitted To The Bar:

  • 1990


  • University of South Carolina School of Law, Columbia, South Carolina, J.D., 1990
    • Honors: American Jurisprudence Award
  • The Citadel - The Military College of South Carolina, Charleston, South Carolina, 1987

Professional Memberships and Achievements:

  • National Association of Criminal Defense Lawyers (NACDL), Lifetime member
  • South Carolina Criminal Defense Lawyer Association, Sustaining member
  • Skyland Ranch, (Drug and Alcohol Treatment Facility)., Board of Directors

Honors and Awards:

  • James K. Coleman Award for Excellence in Constitutional Law
  • Court qualified breath test expert witness regarding the Data master breath testing instrument

Knowledge Means Results. We fight to Win.
Call Now to Discuss Your DUI Defense Options

John Drennan, of the Drennan Law Firm, graduated from The Citadel in 1987 and attended the University of South Carolina School of Law. While in law school, John was awarded an American Jurisprudence Award and was a certified patrol officer FOR THE TOWN OF OAK BLUFFS on Martha's Vineyard, Massachusetts. Mr. Drennan worked in Phillip Rollins District Attorney's Office for Cape Cod and the Islands.

Upon graduation, John was sworn as a lawyer in South Carolina; thereafter, John rose to the position of Senior Trial Staff Attorney for the Charleston County Public Defender’s Office in Charleston where he successfully tried over 20 cases in four years. John attended the National Criminal Defense College (known as the "trial college") and became a Trial Lawyer for Joye Law Firm and focused his practice primarily on traffic law cases. Mr. Drennan is an attendee of eleven summer sessions of the NATIONAL COLLEGE FOR DUI DEFENSE held at Harvard University Law School in Cambridge, Massachusetts. Lastly, John is a Lifetime member of the National Association of Criminal Defense Lawyers (NACDL), and a sustaining member of the South Carolina Criminal Defense Lawyer Association.

Attorney Drennan has been involved in difficult cases all his career ranging from death penalty cases, felony DUI death cases, sexual assaults and domestic assaults and has tried drug cases against the F.B.I., D.E.A., and the A.T.F. in United States District Court. Mr. Drennan has attended numerous DUI training seminars as both as an attendee and as a lecturer. He is a court qualified breath test expert witness regarding the Datamaster breath testing instrument and has testified on several occasions regarding the inaccuracy of the Datamaster. John has lectured Judges, Police Officers and Lawyers regarding DUI issues in the State of South Carolina. Mr. Drennan is on the Board of Directors for Skyland Ranch, (Drug and Alcohol Treatment Facility).

Mr. Drennan has also been an Adjunct Professor in the English Department at The Citadel where he taught Rhetoric in the Law, Legal Writing and Coached the Mock Trial Team. Presently Mr. Drennan volunteers his time by assisting Cadets at The Citadel Counseling Department and is a guest speaker with the Character and Values Series conducted at The Citadel.

Get a Free Consultation

Captcha Image