Texas prosecutes marijuana and THC-related DWIs the same way it prosecutes alcohol DWIs, but the science behind proving impairment is a lot shakier. There’s no legal limit for THC in your blood the way there is for alcohol, so the State leans almost entirely on officer observations and field sobriety tests to make its case.
What Makes These Cases Different
- No per se limit. Texas has no law setting a specific THC blood level that counts as automatically intoxicated, unlike the 0.08 BAC standard for alcohol.
- Delta-8 counts too. If a state expert testifies that Delta-8, Delta-9, THCA, or any other cannabinoid impaired your driving, you’re facing the same DWI penalties as an alcohol case.
- Legal products aren’t a defense. CBD and hemp-derived products are legal to possess in Texas, but that doesn’t matter if the State claims they impaired you behind the wheel.
How Texas Punishes It
The penalty structure mirrors a standard DWI: up to 180 days in jail and a $2,000 fine for a first offense, with the same escalation for second and third offenses.
Where These Cases Are Won
Blood testing for THC is far less precise than breath testing for alcohol, and THC can stay detectable in your system for weeks after any impairment has worn off. Whether the state’s toxicologist can connect a lab result to impairment at the time you were driving, rather than just proving prior use, is frequently the whole case.
Charged With a Marijuana or THC DWI? Contact Blass Law Now
Contact Blass Law for a confidential case evaluation or call (713)-664-4000.
Reviewed by Jay Blass Cohen, founder of Blass Law PLLC — ACS-CHAL Forensic Lawyer-Scientist, certified Drug Recognition Expert, and SFST instructor, serving Houston since 2009. This article is general information, not legal advice for your situation. Prior results do not guarantee a similar outcome.