What Do You Do When an Employee Tests Non-Negative?

🚨  A non-negative rapid test result is not a positive test. Acting as if it is, including removing or terminating an employee, before proper confirmation can expose your company to significant legal liability.

The moment you receive a non-negative drug test result on one of your employees, the clock starts ticking, not just on your safety response, but on a series of required procedural steps that determine whether your subsequent actions are legally defensible. Most Jacksonville employers we consult with do not know these steps exist. They see a red line on a rapid drug test cup and assume the process is over. It is not. In fact, it is just beginning.

This post walks you through exactly what should happen after a non-negative result and explains why skipping or shortcutting these steps is one of the most common and costly mistakes private employers make.

Step One: Understand What 'Non-Negative' Actually Means

There is a critical distinction between a non-negative result and a confirmed positive result, and it matters enormously from a legal standpoint.

A non-negative result means a rapid screening test has detected a substance or the presence of something that may be that substance above a screening threshold. It is not a confirmation of drug use. Rapid screening tests, including the urine dip cups and oral fluid devices many employers purchase at pharmacies or warehouse clubs, are designed as preliminary screeners only. They are subject to false positives from legal medications, dietary supplements, food products, and cross-reactive compounds.

A confirmed positive result can only come from a laboratory, specifically, an HHS-certified laboratory using Gas Chromatography/Mass Spectrometry (GC/MS) or equivalent confirmatory methods that identify and quantify the specific substance.

⛔  Terminating an employee based solely on a rapid test result, before laboratory confirmation, is a serious procedural and potentially legal error, regardless of your confidence in the result.

Step Two: The Chain of Custody and Why It Protects You

Every legally defensible drug test begins with a proper chain of custody. A documented, unbroken record of the specimen from the moment it is collected until the result is reported. In the world of non-DOT testing, this is typically accomplished using a custody and control form (CCF), though non-federal employers may use a non-federal CCF or a laboratory-specific equivalent.

Chain of custody documentation records: who collected the specimen, how the specimen was secured and sealed, what laboratory received it, and who handled it at each step. Without it, any test result can be challenged as potentially contaminated, mislabeled, or tampered with. The chain of custody is not a formality. It is the legal foundation your termination decision will stand on.

When employers conduct their own testing using rapid cup kits purchased from a supply store, they typically have no meaningful chain of custody. They have a photo of a test cup. This is not protection. This is exposure.

Step Three: The Medical Review Officer. The Step Most Employers Skip Entirely

This is where the process breaks down most often for private, non-DOT employers in Jacksonville: the Medical Review Officer or MRO.

An MRO is a licensed physician with specific training in drug and alcohol testing who serves as an independent, objective reviewer of laboratory results. The MRO's role is to receive the laboratory result and contact the employee directly to determine whether there is a legitimate medical explanation for the result (before it is reported to the employer).

Common examples where the MRO process prevents unjust termination:

• An employee tests positive for amphetamines — which turns out to be their prescribed ADHD medication
• An employee tests positive for opiates — which are prescribed post-surgery pain medication
• An employee tests positive for a substance at a level that falls within prescribed therapeutic ranges

Without MRO review, employers who terminate these employees may face claims for wrongful termination, disability discrimination under the Americans with Disabilities Act (ADA), or violations of Florida employment statutes. The MRO process is not optional in a well-designed program. It is the safeguard that makes your positive results legally usable.

💡 Only after the MRO reviews the lab result and confirms it as a verified positive, with no legitimate medical explanation, do you have a result you can act on with confidence.

Step Four: What to Do With the Employee While You Wait

One of the most common and understandable questions employers ask is: 'What do I do with the employee between the non-negative rapid result and the confirmed lab result?' This is a reasonable concern, particularly in safety-sensitive roles.

Best practice is to remove the employee from safety-sensitive functions temporarily, placing them on paid administrative leave or reassigning them to non-safety-sensitive duties if available until MRO-verified results are received. This approach balances your duty to maintain a safe workplace with the employee's right not to be prematurely punished for an unconfirmed result.

The timeline for laboratory confirmation varies, but typically ranges from 24 to 72 hours for most substances. 

Step Five: When the MRO Verifies a Positive, Now What?

Once you receive a verified positive result from the MRO, you are on solid legal ground to take employment action consistent with your written policy. This is where having a clearly documented policy becomes essential again because your response must align with the consequences you stated in writing when the employee was hired.

Common policy responses to a verified positive result include:

• Termination for first offense (common in safety-sensitive industries)
• Mandatory referral to an Employee Assistance Program with a return-to-duty agreement
• Suspension pending completion of a substance abuse evaluation

Whichever consequence your policy prescribes, apply it consistently. Selective enforcement, treating one employee differently from another in the same situation, is the fastest path to a discrimination claim.

How Urgent Lab Services Supports You Through the Entire Process

We do not hand you a test result and leave you to figure out the rest. Our role is to be your guide through the entire process from the moment of collection through MRO-verified results and policy response. We:

• Conduct mobile, on-site collections at your Jacksonville location using proper CCF documentation and certified laboratory partnerships
• Coordinate specimen shipment to HHS-certified laboratories with rapid turnaround options
• Facilitate MRO review of all non-negative results before results are reported to you
• Are available after hours and on weekends for post-accident and reasonable suspicion collections because incidents do not wait for Monday morning
• Consult with your HR team on appropriate next steps once verified results are received

The entire process we just described — rapid screen, laboratory confirmation, MRO review — is what your testing program should look like every time. Anything less is not testing. It is guessing. And guessing with an employee's livelihood and your company's legal exposure is not a risk worth taking.

📞  Had a Non-Negative Result and Not Sure What to Do Next?

Call us right now. We are available after hours for urgent situations. We will walk you through each step and make sure your company is protected.

Call 904-686-6456