Prosper DWI Lawyers

A DWI arrest in Prosper is the beginning of two simultaneous legal proceedings: a criminal case that can result in jail time, fines, and a permanent criminal record, and an administrative case through the Texas Department of Public Safety that can suspend your driver’s license within days. Prosper’s expanding restaurant and retail corridors along Preston Road and Highway 380 have become active DWI enforcement zones. The Prosper Police Department is relatively small but aggressive, and DWI arrests in Prosper are typically processed through the Collin County jail system in McKinney.

At Deandra Grant Law, DWI defense is where our firm was built. Since 1994, lead attorney Deandra Grant has defended thousands of DWI cases across North Texas. Our attorneys hold ACS-CHAL Forensic Lawyer-Scientist designations which is advanced forensic science training that allows us to challenge the prosecution’s evidence at the scientific level, not just at the procedural level.

In addition, Deandra Grant literally “wrote the book” on DWI defense in Texas: The Texas DWI Manual

Why the Science Behind Your DWI Matters

Most DWI defense attorneys challenge DWI cases by arguing that the officer didn’t follow proper procedures, i.e. the traffic stop was illegal, the field sobriety tests were administered incorrectly, or the breath test machine wasn’t calibrated. These are valid challenges, and we raise them when they apply.

But our forensic training allows us to go deeper. We challenge the science itself:

• Blood testing: We understand the gas chromatography with flame ionization detection (GC-FID) methodology used to analyze blood samples, including sources of error such as coelution, contamination, in vitro fermentation by Candida albicans, and improper blood draw procedures
• Breath testing: We challenge breath test results based on partition ratio variability, mouth alcohol contamination, medical conditions like GERD and diabetes that produce false positives, and the specific limitations of the Intoxilyzer 9000
• Field sobriety tests: We challenge the administration, scoring, and interpretation of Standardized Field Sobriety Tests based on the NHTSA protocols and the scientific literature on their reliability
• Retrograde extrapolation: When the prosecution tries to calculate what your BAC was at the time of driving based on a test taken later, we challenge the scientific validity of their math

Deandra Grant Law – DWI Defense Helps Residents Across Texas  – Including: Allen , Arlington, Belton, Cleburne, Collin County, Dallas, Denton, Fairview, Fort Worth, Gainesville, Granbury, Hood County, Johnson County, Lewisville, Little Elm, McKinney, Park Cities, Parker County, Plano, Princeton, Richardson, Rockwall, Rowlett, Royse City, Southlake, Sunnyvale, The Colony, Waco, and Weatherford.

DWI Penalties in Texas

First Offense (Class B Misdemeanor)

• 72 hours to 180 days in county jail
• Fine of up to $2,000
• Driver’s license suspension of 90 days to 1 year
• Possible ignition interlock device

First Offense with BAC 0.15+ (Class A Misdemeanor)

• Up to 1 year in county jail
• Fine of up to $4,000
• Mandatory ignition interlock device
• Permanent conviction — no deferred adjudication available

Second Offense (Class A Misdemeanor)

• 30 days to 1 year in county jail
• Fine of up to $4,000
• Driver’s license suspension of 180 days to 2 years
• Mandatory ignition interlock device

Third Offense (Third-Degree Felony)

• 2 to 10 years in the Texas Department of Criminal Justice
• Fine of up to $10,000
• Mandatory ignition interlock device

The 15-Day ALR Deadline

Critical: If you were arrested for DWI in Prosper, you have only 15 days from the date you were given notice of suspension to request a hearing to challenge the automatic suspension of your driver’s license. If you miss this deadline, your license will be suspended automatically. Contact us immediately so we can file this request and protect your driving privileges while your case is pending.

Collin County DWI Courts

DWI cases arising from Prosper are heard in the Collin County courts at the Russell A. Steindam Courts Building in McKinney. First and second-offense DWIs are typically assigned to one of the seven County Courts at Law, while felony DWI cases are assigned to one of the 15 District Courts. Our attorneys are familiar with the judges, prosecutors, and procedures in every Collin County criminal court.

Garrett Discovery Digital Forensics Training

Attorney Douglas Huff has completed advanced digital forensics training with Garrett Discovery, one of the nation’s leading forensic firms. This training is directly applicable to DWI cases that involve cell phone GPS data, dash camera footage, body camera video, and other digital evidence. When the prosecution uses digital evidence to support its DWI case, we have the training to evaluate and challenge it.

Defend Your DWI Case with Science — Contact Us Today

If you have been arrested for DWI in Frisco or anywhere in Collin County, contact Deandra Grant Law for a free, confidential consultation. Our attorneys have the scientific training to challenge the prosecution’s breath tests, blood tests, and field sobriety tests at a level most defense attorneys cannot match.