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How to choose a workplace drug testing vendor: a buyer's checklist
What to verify about the lab, the collector, the MRO, the chain of custody, and the service before you sign anything.
A drug test that cannot be defended in a hearing or an audit is worse than no test. If the collection was performed by an uncertified collector, the chain of custody has gaps, the lab is not HHS-certified, or the MRO is not board-certified, the positive result you took action on may not hold up.
The goal is not just to test — it is to collect a defensible specimen with documentation that survives scrutiny. HR teams evaluating vendors should verify credentials and process before price.
Use this checklist when comparing mobile, clinic, and hybrid programs — especially if DOT and non-DOT collections share the same sites.
Why vendor selection matters more than most HR teams realize
A drug test that cannot be defended in a hearing or an audit is worse than no test. If the collection was performed by an uncertified collector, the chain of custody has gaps, the lab is not HHS-certified, or the MRO is not board-certified, the positive result you took action on may not hold up. The goal is not just to test — it is to collect a defensible specimen with documentation that survives scrutiny.
The collector
Ask whether collectors are trained and certified to DOT 49 CFR Part 40 standards. For DOT collections, certification is required. For non-DOT collections, Part 40-trained collectors are the industry standard for defensibility. Ask how recently collectors completed training and whether they conduct collections regularly enough to stay current. Collector error — incorrect CCF completion, improper collection procedure, failure to follow shy bladder protocol — is one of the most common sources of test cancellation.
See what to expect from on-site drug testing for how qualified collectors run a typical employer event.
The laboratory
HHS-certified labs are the federal standard for workplace drug testing. For DOT collections, HHS certification is mandatory. For non-DOT collections, HHS-certified labs follow the same quality standards. Ask which labs your vendor uses and verify their current certification at samhsa.gov. The lab should provide certified and confirmed results using GC-MS confirmation.
The MRO
A qualified MRO is a licensed physician with specific training in federal workplace drug testing and certification from a recognized MRO certification body (AAMRO or MROCC). For DOT programs, MRO review is mandatory. For non-DOT programs, using an MRO protects you from acting on a result that should have been overturned by a valid prescription or medical explanation.
Our MRO role guide for employers explains where MRO review fits after the lab reports.
Chain of custody
Ask how the vendor handles the CCF — paper or electronic, how it is stored, and how long documentation is retained. Ask what happens when a chain of custody error is identified: who notifies the employer, what triggers a recollection, and whether errors are communicated proactively or only when discovered.
Service and coverage
For mobile testing specifically: confirm the vendor's coverage for your locations, their typical dispatch time for post-accident and reasonable suspicion events, and whether they can support multi-site hiring events or large-batch random collections. Ask for references from companies in your industry and size range. The cheapest option for a standalone pre-employment test is rarely the right choice for a full workplace testing program.
Compare logistics and downtime in employer drug testing cost and timing before you sign a long-term agreement.
Evaluate us against your checklist
Share locations, DOT mix, and dispatch needs—we answer collector certification, lab routing, and mobile coverage before you commit.