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About Tiffini K. Duncan
Tiffini is a seasoned DUI attorney who has handled thousands of DUI cases. She has been on both sides of the law and knows how to fight for you. Her practice is primarily focused on DUI defense and she is not just a pleader; she is an experienced and skilled DUI trial attorney who takes cases to jury trial when the circumstances dictate. She has excellent negotiating skills and works hard to protect the driving privileges of drivers who come to her for help. Most cases do not go before a jury, but by aggressively investigating and working each case, she is able to negotiate from a position of strength, as prosecutors know that she will take a case all the way through jury trial when the circumstances warrant a jury trial. She joined the Duncan Law Firm in 2010, bringing energy and creativity to the firm. In 2015, she became the managing owner. Tiffini combines the tenacity of an experienced lawyer with genuine compassion for her clients. Tiffini also teaches other lawyers specifically about DUI laws. In November 2016, Tiffini was a course instructor on winning your case through pre-trial motions in DUI cases, at the 6th annual DUI Super Symposium. In May of 2018, Tiffini was a speaker at a continuing legal education seminar, Georgia DUI Update, to instruct other lawyers on DUI laws and litigation practices. She attended the University of Arkansas, where she earned her B.A. in Political Science Cum Laude in 2002, and her J.D. degree Magna Cum Laude from the University of Arkansas School of Law in 2005. She attended law school on a full academic scholarship, served as a Member of the Arkansas Law Review, and graduated in the top 10% of her class.
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Virtual Forensic Library

NCDD members have access to a comprehensive forensic library that provides invaluable information to be used when defending clients charged with DUI.
This library includes scientific articles on drug and alcohol intoxication, toxicology and pharmacology, methods of testing for blood alcohol content, field sobriety testing, potential errors that may occur during testing, accident reconstruction, expert testimony, and evidentiary rules. This valuable information can ensure that you provide a high quality defense to clients charged with DUI based on the circumstances of their case and the laws in their state.
FROM OUR BLOG
Keeping FSTs Out of a Trial
04/23/2025
Written by Neil Halttunen I want to address a common issue that DWI practitioners are facing, trying to keep FSTs out of a trial. One way is to take the position that FSTs are scientific evidence and make the prosecutor lay scientific foundation which they rarely can do. The HGN test was the result of several studies. See Generally Session 8 of...
Ethics Task Force Blog
04/15/2025
Written by Jonathan Dichter The Heart of Client Care: Moving Beyond Case Management In the legal profession, we often talk about "case management" - the systems and processes that keep our cases moving efficiently. But what about *client care*? True client care goes beyond deadlines and filings; it's about treating clients as *people*-scared, uncertain, and in need of guidance. And when done...