Texas drug testing laws for employers: pre-employment testing rules (2026)

Texas places almost no state-law limits on private employers that drug test job applicants. As of October 2026, there is no general Texas statute setting testing procedures for private employers; the Texas Workforce Commission says Texas and federal law allow private employers to adopt testing policies with very few restrictions, and the old workers' compensation drug-policy rule was repealed in 2005. What does apply: federal DOT testing for regulated roles, the federal ADA and civil rights laws, the documentation TWC expects in unemployment cases, and no employment protection for medical cannabis patients.

Does Texas have a drug testing law for private employers?

No general one. The Texas Workforce Commission's Texas Guidebook for Employers says that under Texas and federal law there is almost no limitation on private employers' right to adopt drug and alcohol testing policies for their workers. Government employers are more constrained, mainly because courts treat testing of public employees without a compelling justification as an unreasonable search.

The guidebook also explains what used to exist: former Labor Code section 411.091 required employers with workers' compensation coverage and 15 or more employees to adopt a drug-free workplace policy, and former rules 169.1 and 169.2 required written testing policies that stated penalties. Section 411.091 was repealed in 2005 and the rules no longer exist; the current text of Labor Code chapter 411 has no drug policy subchapter. TWC still recommends keeping the policy in writing and specific, because that is what holds up in unemployment cases and lawsuits.

What are the practical rules for pre-employment drug tests in Texas?

With no statutory checklist, these points come from TWC's guidance and federal law:

1. Timing. A test for illegal drugs is not a medical exam under the ADA, so it may be given at any point in the selection process. TWC notes most companies test only final candidates because of cost.
2. Who pays. Texas and federal law have no specific rule. Most employers pay; TWC cautions that charging applicants could raise equal employment concerns if it discourages minority applicants, or minimum wage concerns if it pushes a first paycheck below the minimum.
3. Written policy and acknowledgment. Give the policy in writing and have each person sign an acknowledgment; TWC suggests a separate consent form for search and testing, including consent to disclose test documentation for claims and lawsuits.
4. Consistent coverage. Testing some but not all employees is legal if the policy covers everyone in defined job categories and is enforced even-handedly.
5. Confidential records. Drug tests are outside the ADA's medical exam rules, but TWC advises treating results as medical records kept in a separate, confidential file.
6. Prescription explanations. After a positive, the EEOC allows an employer to ask about lawful medications to validate the result. See pre-employment medical exams under the ADA.

What proof does TWC expect if a drug test leads to a firing?

Applicant decisions rarely reach TWC, but the same policy will govern the person once hired, so build the file now. The guidebook cites TWC precedent Appeal No. 97-003744-10-040997, under which an employer showing that a positive test was misconduct must present:

• a policy prohibiting a positive result, with the claimant's acknowledgment of receipt;
• evidence that the claimant consented to testing under the policy;
• documentation that the chain of custody of the sample was maintained;
• laboratory documentation that the initial test was confirmed by gas chromatography/mass spectrometry; and
• the result expressed as positive above a stated threshold.

For DOT-regulated employees, TWC precedent (MC 485.46 in its Appeals Policy and Precedent Manual) holds that proof of compliance with DOT's medical review officer standards can serve as proof of a confirmed result.

What does Texas say about marijuana and hiring?

• Medical (low-THC) cannabis. The Texas Compassionate Use Program, run by the Department of Public Safety, began with Senate Bill 339 in 2015. Chapter 487 of the Health and Safety Code, which governs the program, regulates dispensing organizations and their staff but contains no protection for patients against employer action.
• Adult-use. Texas has no adult-use law: possession of marijuana remains an offense under Health and Safety Code section 481.121.
• Result: a Texas employer may generally treat a THC-positive applicant like any other positive under its written policy, including a registered low-THC patient, unless a federal rule such as the ADA's handling of lawful prescriptions applies to the specific medication.

Which federal rules apply in Texas?

• DOT-regulated roles. Commercial drivers, pipeline workers and other covered employees are tested under 49 CFR Part 40; a driver needs a verified negative pre-employment result before the first safety-sensitive function (49 CFR 382.301). For Texas employers, this is often the only mandatory testing regime.
• Rescheduling. The April 28, 2026 order moved FDA-approved and state-medical-license marijuana to Schedule III, and DEA scheduled a hearing on broader rescheduling to begin June 29, 2026. DOT's Part 40 guidance (May 15, 2026) says a state-licensed marijuana product still cannot turn a DOT positive into a negative, and 49 CFR 40.151 bars accepting hemp or CBD claims as an explanation.
• Federal contractors and grantees. TWC notes that some federal contracts and grants require drug-free workplace policies; the FAR Drug-Free Workplace clause requires a policy statement and awareness program but not testing.

What should staffing agencies placing workers in Texas do?

• Test to the client contract. TWC points out that some contracts require testing of workers who enter a client's facility, and that the contractor then does not have to test its other employees who do not go to that site. Write the client-site rule into your policy so coverage is defined, not ad hoc.
• Keep DOT drivers separate. Place commercial drivers through a Part 40 program with clearinghouse and MRO steps, not your general panel.
• Get signed acknowledgments at onboarding. An acknowledged policy and consent are two of TWC's five elements if an assignment ends over a test.
• Licensing: see Texas staffing agency licensing.

Texas drug testing laws at a glance

A checklist before you test a candidate in Texas

1. Write a policy that names covered job categories, the panel, cutoffs and what counts as a violation.
2. Get a signed acknowledgment and testing consent, including consent to disclose documentation.
3. Use a lab that confirms positives by GC/MS and keeps chain-of-custody records.
4. Route positives through an MRO, and ask only about lawful medications.
5. Keep results in a separate confidential file.

For states that do restrict testing, read drug testing laws in hiring; for policy wording, use the pre-employment drug testing policy template; and for the rest of onboarding, see hiring employees in Texas. If the same offer also depends on a background check, see Texas background check laws. Next door, Oklahoma regulates testing in detail and changes its medical marijuana rule on November 1, 2026.