Texas has not legalized marijuana. It has not decriminalized it. But since 2019, prosecuting a marijuana case in Texas has become scientifically more complicated than it used to be and understanding why is essential for anyone arrested with cannabis in this state.
The short version: marijuana and hemp are the same plant. The legal distinction between them is a laboratory measurement. That distinction has created a burden of proof that many county prosecutors cannot meet, has led to mass dismissals in the state’s largest counties, and has given defense attorneys a science-based challenge that did not exist before House Bill 1325.
The Penalty Structure: What You’re Facing Under §481.121
Texas Health and Safety Code §481.121 governs marijuana possession. The penalties scale by weight:
Under 2 ounces: Class B misdemeanor — up to 180 days in county jail, fine up to $2,000.
2 to 4 ounces: Class A misdemeanor — up to 1 year in county jail, fine up to $4,000.
4 ounces to 5 pounds: State jail felony — 180 days to 2 years in state jail, fine up to $10,000.
5 to 50 pounds: Third-degree felony — 2 to 10 years in prison, fine up to $10,000.
50 to 2,000 pounds: Second-degree felony — 2 to 20 years, fine up to $10,000.
Over 2,000 pounds: First-degree felony — 5 to 99 years, fine up to $50,000.
Every marijuana conviction also triggers an automatic six-month driver’s license suspension — even if you were not driving when arrested and the offense had nothing to do with a vehicle.
THC Concentrates Are Treated Completely Differently
One of the most consistently surprising facts about Texas marijuana law: a small amount of THC concentrate (ex. a vape cartridge, wax, dab, or edible) is treated as a felony, while the same amount of marijuana flower is a misdemeanor.
THC in extracted or concentrated form is classified under Penalty Group 2 of the Texas Controlled Substances Act, not under the marijuana statute. Penalty Group 2 possession of any amount less than one gram is a state jail felony (180 days to 2 years). The same weight of marijuana flower would be a Class B misdemeanor. The disparity is stark and catches many people completely off guard.
This classification also means the hemp/HB 1325 defense does not apply to THC concentrates. The PG2 pathway is a separate track with its own evidentiary requirements.
The HB 1325 Problem: Why Lab Testing Now Matters for Every Marijuana Case
In 2019, Texas passed House Bill 1325, legalizing hemp (cannabis plants containing 0.3% THC or less by dry weight). The intended purpose was allowing Texas farmers to grow industrial hemp and retailers to sell CBD products.
The unintended consequence was that the legal definition of marijuana in Texas changed. “Marihuana” under §481.002(26) now means cannabis containing more than 0.3% THC. Hemp containing 0.3% or less is legal. And since marijuana and hemp are visually and olfactorily identical (a trained officer cannot tell them apart by sight or smell) the State must prove through laboratory analysis that what was seized contains more than 0.3% THC before a possession conviction can stand.
This created an immediate problem for prosecution. Most Texas counties lacked laboratory infrastructure capable of providing quantitative THC concentration results. In the months after HB 1325 took effect, Harris, Travis, Tarrant, Bexar, Williamson, and other counties announced dismissals of pending marijuana cases and moratoria on new charges because they could not prove THC concentration above the legal threshold.
The field test problem. Law enforcement officers use colorimetric field tests to detect the presence of cannabinoids. These tests reliably indicate that cannabinoids are present. They cannot determine whether the THC concentration exceeds 0.3%. An officer’s field test result cannot, by itself, establish that the substance is illegal marijuana rather than legal hemp.
The 2025 update. Effective September 1, 2025, Texas law now requires labs to measure Total THC (Delta-9 THC plus THCa) rather than Delta-9 THC alone. While this broadens what is chemically illegal, it also increases the technical burden on the State: labs must now provide precise Total THC values using validated quantitative methods.
The HPLC Testing Requirement and What the Defense Examines
When the State does have laboratory results, the analysis should use High-Performance Liquid Chromatography (HPLC) or Gas Chromatography (GC) for quantitative THC determination. The defense examination of any lab report in a marijuana case now includes:
Methodology. Was the test qualitative (detected/not detected) or quantitative (measured concentration)? Only quantitative results above 0.3% can establish the substance is marijuana rather than hemp.
Calibration and instrument records. Were the instruments properly calibrated and maintained? Were calibration standards traceable to certified reference materials?
Measurement uncertainty. Every quantitative measurement has an inherent range of uncertainty. A result of 0.31% Total THC with a measurement uncertainty of ±0.05% arguably includes values below the legal threshold. The State must prove beyond a reasonable doubt that the substance exceeds the limit.
Chain of custody. Was the integrity of the sample maintained from seizure through analysis? Any break in chain of custody raises questions about whether what was tested is what was seized.
Prosecutorial Discretion and Local Enforcement Variation
Even where lab testing is available, prosecutorial and law enforcement policies vary across the DFW metroplex. Some agencies prioritize marijuana enforcement; others have deprioritized low-level possession. The practical result is that a Class B marijuana arrest in Dallas County may be handled very differently than the same arrest in a smaller surrounding county. Understanding the local landscape is part of effective defense strategy.
Deferred Adjudication and the Path to Non-Conviction
For most first-offense marijuana possession cases, deferred adjudication is available. Successful completion results in dismissal (not a conviction) and creates a pathway to a petition for nondisclosure. This matters for employment background checks, professional licensing, and housing applications.
Speak With Deandra Grant Law
If you have been arrested for marijuana possession in Texas, the most important thing to understand is that the State’s case depends on laboratory evidence that may not exist, may not meet the required standard, or may be challengeable on scientific grounds.
Call (214) 225-7117 or visit texasdwisite.com for a confidential consultation.