5 DOT Panel Drugs: Named Analytes and Cutoffs for U.S. Employers

The DOT 5-panel urine test screens for five drug classes: marijuana (THCC), cocaine (benzoylecgonine), amphetamines, opioids, and phencyclidine (PCP). Collection and testing follow 49 CFR Part 40, with every sample processed at an HHS-certified laboratory under SAMHSA’s mandatory guidelines.

TL;DR:

• The federal cutoff levels for marijuana, cocaine, amphetamines, opioids, and PCP determine positive results, with fentanyl added since July 2025.
• DOT urine collection follows strict chain-of-custody procedures, and only HHS-certified labs using confirmatory testing can produce compliant results.
• A positive drug test requires review by a licensed medical review officer who evaluates prescription use and specimen validity before final reporting.
• Detection windows vary by drug and usage pattern, with heavy marijuana use potentially detectable for several weeks, unlike other substances usually cleared in days.
• DOT tests are standardized across agencies, applying only to safety-sensitive roles, while non-DOT panels often include broader drug classes like benzodiazepines and methadone.

Table of Contents

• The Five Drug Classes, Analytes, and Urine Cutoffs
• How Collection and Lab Testing Actually Work
• Why the Medical Review Officer Reviews Every Positive
• How Long Drugs Stay Detectable, and Why That Varies
• DOT Versus Non-DOT Panels: Why the Difference Matters
• Common Reasons DOT 5-Panel Tests Come Back Positive or Invalid
• What a Positive Result Actually Means for an Employee
• Which Agencies Oversee DOT Drug Testing
• What This Means for Employers and Employees
• Getting DOT-Compatible Testing Through Countrywidetesting
• FAQ
• Sources

The Five Drug Classes, Analytes, and Urine Cutoffs

Each of the five DOT classes covers more ground than its name suggests. Lab reports list specific analytes, not just the drug family, so HR teams and donors benefit from knowing the federal nomenclature.

SAMHSA’s mandatory guidelines for federal workplace drug testing set the initial screening cutoff and the confirmatory cutoff for each analyte. A specimen only counts as positive once it clears the confirmatory threshold on a second, more precise test.

• Marijuana metabolite (Δ9THCC): initial cutoff set by federal guidelines, confirmatory cutoff set by federal guidelines.
• Cocaine metabolite (Benzoylecgonine, BZE): initial cutoff set by federal guidelines, confirmatory cutoff set by federal guidelines.
• Amphetamines (AMP, MAMP): reported under amphetamine and methamphetamine designations, each with its own confirmatory threshold.
• Opioids: cover morphine (MOR), codeine (COD), 6-acetylmorphine (6-AM) for heroin use, and semisynthetic analytes such as oxycodone, oxymorphone, hydrocodone, and hydromorphone.
• Phencyclidine (PCP): a single analyte with its own federal cutoff.

Fentanyl now appears on federal panels too. SAMHSA’s guidance confirms fentanyl testing became part of the Mandatory Guidelines effective July 7, 2025, which means current federal lab reports may list FENT alongside the traditional five.

Because a single class like “opioids” can expand into five or six separate analytes on a lab report, employers who read these results without context sometimes misinterpret what triggered a positive. Knowing the nomenclature in advance prevents that confusion.

How Collection and Lab Testing Actually Work

DOT urine collection is not a casual process. It follows a chain-of-custody protocol designed to protect both the donor and the integrity of the sample.

• A trained collector documents every step, from specimen split to sealing, on a federal custody-and-control form.
• The collector checks the specimen’s temperature within four minutes of collection to rule out substitution.
• The lab runs an initial immunoassay screen first; only specimens that screen positive move to confirmatory testing.
• Confirmatory testing uses gas chromatography/mass spectrometry (GC/MS) or liquid chromatography/tandem mass spectrometry (LC/MS/MS), both far more specific than the initial screen.
• Laboratories also run validity tests for pH, creatinine, and oxidizing adulterants, as required under 49 CFR § 40.87.

A specimen that looks diluted, substituted, or adulterated triggers additional validity testing before any result gets reported. Only HHS-certified labs using the federally authorized analyte list and reporting format satisfy DOT requirements. A test run at an uncertified lab, even if accurate, does not count for DOT compliance purposes.

Pro Tip: Ask your testing provider to confirm HHS certification in writing before scheduling any DOT collection; a non-certified lab result can void the entire test.

Why the Medical Review Officer Reviews Every Positive

No DOT laboratory result reaches an employer directly. A Medical Review Officer, a licensed physician trained in substance abuse disorders, reviews every confirmed positive before it becomes final. The DOT’s MRO guidance describes this as an independent clinical and legal checkpoint, not a formality.

• The MRO contacts the donor directly to ask about any legitimate medical explanation, such as a valid prescription.
• A confirmed positive with no valid explanation becomes a verified positive, reported to the employer.
• A positive tied to a documented prescription may be reported as negative.
• Tampered or diluted specimens get reported as substituted or invalid, which can trigger a retest.

Employers receive only the MRO’s final determination, not clinical details behind it. Donor medical information stays confidential unless law or the donor authorizes disclosure. When a case involves a gray area, such as a disputed prescription, looping in occupational health or legal counsel early avoids missteps later. For a deeper walkthrough of this process, our guide to the MRO role covers the verification steps in more detail.

How Long Drugs Stay Detectable, and Why That Varies

Detection windows in urine depend heavily on the drug, dose, frequency of use, and individual metabolism. A single-use window and a chronic-use window for the same substance can differ by weeks.

• Cocaine and amphetamines are typically detectable for 2 to 4 days after use.
• Opioids such as codeine and morphine usually clear within 2 to 3 days, though patterns vary by dose.
• PCP can remain detectable for roughly a week in occasional users, longer with heavy use.
• Marijuana is the outlier: occasional use may clear in a few days, but chronic, heavy use can remain detectable for several weeks.

Detection windows are not fixed numbers. Recent federal guideline updates, including the morphine confirmatory cutoff change, show that even the thresholds labs test against shift over time, which is why relying on anecdotal “safe window” advice is risky.

A common myth is that detox drinks or a few days of abstinence guarantee a clean result. Metabolism, hydration, body fat, and usage history all affect clearance, so there is no reliable shortcut, and a diluted specimen is more likely to trigger a validity retest than to produce a passing result.

DOT Versus Non-DOT Panels: Why the Difference Matters

DOT testing is standardized. Every regulated employer tests the same five classes, using the same cutoffs, reported the same way. Employers cannot add analytes to a DOT test on their own; any expansion requires HHS authorization under the Mandatory Guidelines.

Non-DOT employer testing works differently. Many employers choose broader panels for positions that are not federally safety-sensitive.

1. Benzodiazepines (such as Valium or Xanax) appear on many 10-panel and 12-panel employer tests but not on the DOT panel.
2. Barbiturates are another common addition for employers wanting broader coverage.
3. Methadone gets added when an employer’s industry or state law calls for it.

If your organization runs both DOT and non-DOT roles, document which panel applies to which position in written policy, and notify employees before testing. Our comparison of 5-panel versus 10-panel testing walks through how to make that call.

Common Reasons DOT 5-Panel Tests Come Back Positive or Invalid

Most failed DOT tests fall into a handful of predictable categories. Recent illicit drug use is the most direct cause, but it is far from the only one.

Prescription medications cause a share of confirmed positives that later get cleared. Opioid painkillers prescribed for a legitimate injury, for example, can trigger a positive screen that the MRO later verifies as negative once the prescription is confirmed. This is exactly why the MRO review step exists: it separates medical explanations from genuine violations.

Specimen validity issues cause a separate category of failures that are not about drug use at all. A specimen flagged as diluted, substituted, or adulterated does not automatically count as a refusal, but it does trigger additional scrutiny. Depending on the circumstances, the donor may be asked to provide another specimen under direct observation.

Refusals to test, whether through failing to show up for a scheduled collection or refusing to provide an adequate specimen, are treated under DOT rules as equivalent to a positive result. This catches employees off guard more often than an actual positive does.

Once a result is verified positive or treated as a refusal, the employee is immediately removed from safety-sensitive duties. Returning to that role requires completing a substance abuse professional (SAP) evaluation and the associated return-to-duty process, which includes follow-up testing over a period set by the SAP.

What a Positive Result Actually Means for an Employee

A verified positive DOT result carries consequences that go beyond a single missed shift. Federal rules require immediate removal from any safety-sensitive function, whether that means driving a commercial vehicle, operating aircraft, or another regulated duty, the moment the MRO confirms the result.

The employee’s name goes into their employer’s required testing record, and depending on the role, into databases such as the FMCSA Drug and Alcohol Clearinghouse for commercial drivers. That record can follow a worker to future DOT-regulated jobs, since prospective employers are required to check it before hiring.

Getting back to safety-sensitive work is not automatic. The employee must complete an evaluation with a substance abuse professional, follow any recommended treatment or education, and pass a return-to-duty test before resuming regulated duties. Unannounced follow-up testing continues for a period the SAP determines, sometimes extending a year or more.

None of this happens without the employee’s knowledge. The MRO interview process gives every donor a chance to explain a positive result before it is finalized, and the consequences only apply once that review confirms no legitimate medical explanation exists. Employees who are unsure about a pending result benefit from understanding this sequence rather than assuming the worst before the MRO has even made contact.

Which Agencies Oversee DOT Drug Testing

DOT drug testing is not run by a single office. The Department of Transportation sets the overarching framework through 49 CFR Part 40, but individual operating administrations apply those rules to their own industries.

The Federal Motor Carrier Safety Administration (FMCSA) oversees commercial truck and bus drivers, including the Drug and Alcohol Clearinghouse that tracks violations across the trucking industry. The Federal Aviation Administration (FAA) applies the same core framework to pilots, mechanics, and other aviation safety-sensitive employees. The Federal Transit Administration (FTA) covers transit workers, while the Federal Railroad Administration (FRA) and the Pipeline and Hazardous Materials Safety Administration (PHMSA) apply it to rail and pipeline workers respectively.

Each agency can tailor certain procedural details to its industry, but the core five-panel scope, the cutoffs, and the MRO verification process stay consistent across all of them because they all draw from the same HHS-published Mandatory Guidelines. That consistency is what makes a DOT test portable: a result verified under FMCSA rules follows the same federal standard a result verified under FAA rules would.

What This Means for Employers and Employees

I’ve spent enough time around workplace drug policy to know most confusion comes from treating DOT testing like a generic screen. It is not. The five classes, the cutoffs, and the MRO review are fixed by federal rule, and the sooner employers build policy around that reality, the fewer surprises they face.

— Alan

Getting DOT-Compatible Testing Through Countrywidetesting

We support compliant chain-of-custody testing for employers and individuals who need results that hold up under federal scrutiny.

For employers building or refreshing a DOT compliance program, we recommend three steps: order lab testing services built for DOT-compatible collection, confirm the testing lab’s HHS certification before scheduling, and set up MRO routing so every confirmed positive gets reviewed before it reaches your HR file.

• Custom panel setups are available to match covered workforce and reporting needs.
• Lab-confirmed results can be ordered directly, with mail-in instructions for proper chain-of-custody handling.
• Support is available for both one-time orders and ongoing employer testing programs.

Start with our lab testing services page to see current options and place an order.

This article is general information, not a substitute for advice from a qualified doctor. Consult a qualified healthcare professional about your own circumstances before acting on anything here.

FAQ

What drugs are included in the DOT mandatory 5 panel?

The DOT mandatory panel screens for marijuana (THCC), cocaine (benzoylecgonine), amphetamines, opioids, and phencyclidine (PCP). As of July 7, 2025, federal guidelines also authorize fentanyl testing within the opioid category.

What drugs show up in a 5 panel drug test?

A 5-panel test reports specific analytes within each class, such as Δ9THCC for marijuana and benzoylecgonine for cocaine, rather than just the drug name. Opioid results can include morphine, codeine, 6-AM, and several semi-synthetic analytes depending on the authorized testing panel.

How far back does a DOT 5 panel drug test go?

Detection windows vary by substance: most drugs clear from urine within a few days to about a week, while chronic marijuana use can remain detectable for several weeks. Individual metabolism, hydration, and frequency of use all affect the actual window.

What drugs are on a DOT drug test?

A DOT drug test checks for the same five classes used across all federally regulated transportation industries: marijuana, cocaine, amphetamines, opioids, and PCP. The DOT’s own guidance confirms this scope applies uniformly to safety-sensitive employees regardless of which agency regulates their job.

Who has to take a DOT 5-panel drug test?

DOT testing applies to employees in safety-sensitive transportation roles, including commercial drivers, pilots, and transit, rail, and pipeline workers covered by agencies like FMCSA, FAA, FTA, FRA, and PHMSA. Our safety-sensitive compliance guide outlines which roles typically fall under these requirements.

Sources

• Mandatory Guidelines for Federal Workplace Drug Testing Programs—Authorized Testing Panels (Federal Register, 2026)
• Frequently Asked Questions About Federal Workplace Drug Testing | SAMHSA

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