Many employers struggle with the decision of whether to conduct drug testing for employment purposes. While the answer is clear for safety-sensitive roles or positions where testing is mandatory, it becomes more complex when testing is optional.

Drug testing decisions have grown more challenging as many states have legalized marijuana for medical use, recreational use, or both. As a result, some employers are finding it difficult to fill certain positions due to a high number of positive marijuana test results.

Drug testing remains important, particularly given the ongoing abuse of substances beyond marijuana. However, a more common question today is whether employers should test specifically for marijuana. Most traditional tests can detect marijuana use but cannot determine when the substance was used.

Marijuana breathalyzers, developed by companies such as Hound Labs and Cannabix, aim to detect delta-9 THC, the psychoactive component in cannabis. Unlike urine and blood tests, these devices are designed to identify recent use within a one- to four-hour window. However, current versions may still require laboratory analysis and can take 24 to 96 hours to produce results.

More recently, a study partially funded by the U.S. Department of Justice explored a portable, low-cost device intended for roadside, on-the-spot testing. This approach differs from existing breath testing methods by targeting specific cannabinoids rather than general presence.

The study, conducted at Virginia Commonwealth University (VCU), introduced a device resembling an asthma inhaler. It uses 3D-printed cartridges combined with a “Fast Blue” dye and gelatin system. Initial colorimetric experiments established foundational data showing the device can detect delta-9 THC, CBD, and CBN across multiple sample types.

Results also indicated that the device could distinguish between delta-9 THC, CBN, and CBD based on color variations. While further validation and real-world testing are needed, the findings provide a proof-of-concept for future roadside or point-of-collection testing technologies.

A patent application has been filed with the U.S. Patent and Trademark Office, outlining a proposed design for a future prototype.

For anyone who has observed a driver using marijuana while on the road, the need for reliable, real-time testing is clear. As laws surrounding marijuana continue to evolve, advancements in detection technology will be critical in supporting workplace safety and public safety efforts.

Sources: Google; marijuanamoment.net