Cannabis laws in the United States are changing quickly, and many employers are finding it difficult to keep up. What used to be a simple part of the hiring process — reviewing a drug test — has become more complicated due to federal rules, state laws, hemp-derived alternatives, medical use, and changing candidate expectations.
One of the biggest areas of confusion is THC. Employers often ask where it comes from, the difference between marijuana and hemp, and what can or cannot be required regarding workplace drug testing, especially for safety-sensitive positions.
Below is a clear overview of what employers should understand.
What Is THC and Why Is It Complex?
THC (tetrahydrocannabinol) is the part of cannabis responsible for impairment. What many employees do not realize is that THC does not only come from marijuana. It can also be found in hemp-derived products such as CBD gummies, delta-8 vape products, and other items sold legally in stores and online.
This sometimes results in employees testing positive after using products they believed were legal or labeled as THC-free.
Marijuana vs. Hemp
Marijuana and hemp come from the same plant, Cannabis sativa. The difference between them is based on THC concentration.
- Marijuana: Illegal at the federal level; contains higher THC levels.
- Hemp: Legal under the 2018 Farm Bill; must contain 0.3% THC or less.
Even with low THC, hemp-derived products can still cause a positive THC result. Product labeling is often inconsistent or inaccurate, and products may contain more THC than advertised.
Legal Use Does Not Equal Workplace Permission
Many applicants assume that because marijuana is legal in their state, employers cannot test for THC. This is not correct.
THC remains illegal at the federal level, and employers are still responsible for maintaining a safe workplace. Industries with safety obligations—such as transportation, manufacturing, energy, and healthcare—cannot ignore impairment risks. Even if use is legal off duty, impairment on the job can cause serious safety issues.
Testing requirements often remain in place for:
- DOT-regulated drivers
- Workers who handle hazardous materials
- Healthcare and patient-care roles
- Public sector or federally funded positions
Legal use does not automatically translate to safe use or permissible workplace use.
Safety Carve-Outs
As more states legalize marijuana, many have also added restrictions on when employers can test for THC. Safety carve-outs are exceptions in state law that allow employers to continue testing for THC if the job is considered safety-sensitive.
A safety-sensitive role is typically defined as one in which impaired performance could cause harm to the employee, others, or the public.
Examples include:
- CDL/DOT transportation roles
- Machinery or forklift operators
- Construction and industrial work
- Healthcare workers and first responders
These carve-outs recognize that while cannabis may be legal, safety remains the priority.
Why This Matters More Now
There is growing federal discussion about rescheduling marijuana, which has led many employees to assume that THC use is permitted or that hemp products cannot cause a positive result. At the same time, companies are seeing:
- More objections to THC testing
- More positive test results
- More confusion about state versus federal rules
Employers should be able to clearly identify:
- Which roles are considered safety-sensitive
- Why those roles are flagged
- What documentation supports the testing requirement
Clear, consistent processes help protect employers.
Key Takeaways
- State legalization does not override workplace safety requirements.
- Hemp-derived products are not guaranteed to be THC-free and can still cause positive test results.
- Safety carve-outs allow employers to continue THC testing for high-risk positions.
- Documented, consistent reasoning protects your testing program.
How AB Global Supports Employers
THC testing is both a compliance issue and a safety issue. AB Global assists employers with:
- Classifying safety-sensitive positions
- Understanding state-by-state testing rules
- Writing and updating policy language
- Managing candidate communication and coordination
Through the Golden Glove Coordination Service, we also help streamline scheduling and testing, especially in rural or hard-to-service locations.
Final Note
As cannabis regulations continue to shift, employers do not have to choose between compliance and safety. Safety carve-outs provide a clear path to maintain safe workplaces while still respecting state laws and employee rights. The regulatory landscape may be changing, but the goal remains the same: protect your workforce, protect your business, and stay compliant.
