Contact Information

The Coffey Firm
4700 Airport Fwy
Ft. Worth, TX 76117
Office: (817) 831-3100
Fax: (817) 831-3340
Map: Click to Map

About Me

Mimi Coffey is a trial attorney with 18 years experience. She is the founder of The Coffey Firm with two locations in Dallas and Fort Worth. The Coffey Firm serves Dallas, Tarrant and Collin counties.




Curriculum Committee, NCDD Journal Committee, Chairman of the Forensic Committee, Chairman of the Recognition Committee,  Diversity Committee


1999 Summer Session Graduate; 2000 Summer Session Graduate; 2004 Summer Session Graduate; 2005 Winter Session Graduate; 2005 Summer Session Graduate, Co-course Director of NCDD’s & TCDLA’s Mastering Scientific Evidence Program (past 9 years)


She is board-certified in DWI by the National College of DUI Defense (NCDD) and has been the Texas delegate for the NCDD for several years preceding her selection as a Regent the NCDD in 2012.

She has also appeared numerous times as a legal commentator for CNN, National Fox News, as well as local Dallas/Fort Worth stations on DWI-related stories. She is also a frequent speaker at both national and statewide seminars.

She is a prolific trial attorney with a proven trial record. She has tried approximately 300 cases, with 80% of them being jury trials in her 18-year career. Her success includes everything from .21 breath tests, blood tests to 3 car accident cases just to name a few. Mimi’s cases have also made good case law for the State of Texas. For example, in Tarvin v. State, it was found that weaving within your own lane was not a traffic violation. In Lajoie v. State, the courts determined that the defendant’s request to have his attorney must be suppressed as opposed to used as evidence of guilt.

She is the author of Texas DWI Defense: The Law and Practice. She is also the author of three nationally-published articles and four state-wide articles.

Mimi has twice attended Indiana University’s Borkenstein Course for state toxicologists both on alcohol and drugs. She has also completed the NHTSA SFST Course, SFST Instructor Course and the 12-Step DRE Mini-Course Program. She is also one of the first attorneys in the United States to attend the Axion Labs Gas Chromatography Training. Her minor in college was Geology lending her a comprehensive and disciplined scientific mind when it comes to scientific and mathematical issues such as blood and breath testing.

Mimi has won the President’s Heart of a Champion Award presented by the Texas Criminal Defense Lawyers Association (TCDLA) numerous times.

Mimi also led the effort to get the State Bar of Texas’ Board of Legal Specialization to recognize the NCDD’s DWI Certification.

Mimi has been active over the past 4 legislative sessions in fighting against bad DWI laws. Her efforts prevented the breath/blood test refusal as being a separate crime. She has advocated for true deferred adjudication for DWI.

Mimi also sued a Dalworthington Gardens police officer for illegally drawing blood. Since her lawsuit, the 2nd Court of Appeals ruled against police officers drawing blood. (The Court of Criminal Appeals overturned this).

Mimi also sued the Texas Department of Public Safety for its double jeopardy surcharge program. Since the initiation of her suit, Texas DPS has instituted amnesty programs based on one’s earning potential.


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