5-Panel Drug Test: Substances Screened, Cutoffs, and Who Needs It

A 5 panel drug test screens a urine sample (or, where authorized, saliva) for five classes of controlled substances: marijuana, cocaine, amphetamines, opioids, and phencyclidine (PCP).¹ It’s the standard panel for Department of Transportation safety-sensitive workers and federal employees, and it’s widely used by private employers and courts. The five classes were chosen because they cover the substances most likely to cause impairment, and the federal cutoff concentrations are set high enough to avoid flagging incidental exposure.

What Each of the Five Panels Actually Detects

Labs don’t look for the drugs in their original form. They look for specific compounds your body produces after use, which is why timing and prescription medications matter so much to the result.

Marijuana

For urine, the lab targets delta-9-tetrahydrocannabinol-9-carboxylic acid (THCA), the metabolite your body produces after processing THC. Oral fluid tests, where authorized, look for THC directly.² THCA lingers far longer than THC itself, which is why urine has a wider detection window than saliva.

Cocaine

The test targets benzoylecgonine, the primary metabolite your body produces breaking cocaine down.² Because it looks for the metabolite rather than the parent drug, it catches use even after the effects are gone.

Amphetamines

The amphetamine panel covers four compounds: amphetamine, methamphetamine, MDMA (ecstasy), and MDA.³ Prescription stimulants for ADHD contain amphetamine, so those medications will trigger this panel. A valid prescription doesn’t disqualify you, but the initial screen will still flag the sample for review.

Opioids

This panel is broader than most people expect. The current federal panel tests for codeine, morphine, hydrocodone, hydromorphone, oxycodone, oxymorphone, and 6-acetylmorphine (6-AM), which is a definitive marker for heroin use. The 2026 HHS guidelines also add fentanyl and norfentanyl.² If you take prescribed opioid medication, expect an initial positive and be ready to verify the prescription through the Medical Review Officer.

Phencyclidine

PCP, sometimes called angel dust, is screened as a single analyte.³ Use has fallen sharply since the panel was designed, but it remains part of the standard five because of how severely it impairs the user.

Cutoff Concentrations

Labs measure the concentration of each substance in nanograms per milliliter and compare it against a federal cutoff. Anything below the cutoff is reported as negative, even when trace amounts are present. That design is deliberate: it keeps passive exposure, like sitting near someone smoking marijuana, from producing a positive.

Testing runs in two tiers. The initial immunoassay uses a higher cutoff to quickly clear obviously negative samples. Anything at or above that cutoff goes to a confirmatory test using mass spectrometry, which identifies the exact molecular structure and eliminates immunoassay false positives. Current federal urine cutoffs:²

Marijuana (THCA): 50 ng/mL initial, 15 ng/mL confirmatory
Cocaine (benzoylecgonine): 150 ng/mL initial, 100 ng/mL confirmatory
Codeine/Morphine: 2,000 ng/mL initial; confirmatory 2,000 ng/mL for codeine and 4,000 ng/mL for morphine
Hydrocodone/Hydromorphone: 300 ng/mL initial, 100 ng/mL confirmatory
Oxycodone/Oxymorphone: 100 ng/mL initial and confirmatory
6-Acetylmorphine (heroin marker): 10 ng/mL initial and confirmatory
PCP: 25 ng/mL initial and confirmatory
Amphetamine/Methamphetamine: 500 ng/mL initial, 250 ng/mL confirmatory
MDMA/MDA: 500 ng/mL initial, 250 ng/mL confirmatory
Fentanyl and norfentanyl: 1 ng/mL initial and confirmatory

The fentanyl cutoff is dramatically lower than the others because fentanyl is active at microgram doses. The high 2,000 ng/mL codeine/morphine threshold is set that way on purpose, to avoid flagging people who ate poppy-seed foods.

How Long Each Drug Stays Detectable in Urine

Detection depends on metabolism, frequency of use, and body composition. Approximate urine windows based on published research:

Marijuana: three to four days after a single use at the 50 ng/mL cutoff. Chronic daily users may test positive for up to 21 days after stopping. The often-repeated “30 days or more” claim overstates the window for most people.
Cocaine: one to three days.
Opioids: one to four days for most compounds.
Amphetamines: one to four days.
PCP: one to six days, longer with heavy use.

Marijuana is the outlier because THC metabolites are fat-soluble and release slowly from body tissue. The other four classes clear through normal kidney function relatively quickly.

Who Requires a 5 Panel Drug Test

DOT Safety-Sensitive Workers

Federal regulations require the 5-panel test for all safety-sensitive transportation workers, including commercial truck drivers, pilots, train engineers, transit operators, pipeline workers, and ship captains.¹ The panel is fixed: employers cannot add substances, remove classes, or otherwise modify it for federally regulated tests. Testing occurs pre-employment, at random, after accidents, on reasonable suspicion, before return to duty after a violation, and during follow-up monitoring.

Federal Employees

The Department of Health and Human Services publishes separate mandatory guidelines for federal workplace testing under Executive Order 12564.² The 2026 HHS panel adds fentanyl, making the federal workplace panel slightly broader than the current DOT panel.

Private Employers

Private companies aren’t required by federal law to use a 5-panel test unless their workers fall under DOT or another agency’s regulations. Many use it anyway for pre-employment, post-accident, and reasonable-suspicion testing. Private employers can also go beyond five, adding substances like benzodiazepines, barbiturates, or synthetic cannabinoids.

Court-Ordered Testing

Courts often require 5-panel testing as a condition of probation or supervised release. In the federal system, a court must revoke supervision if a person has four positive tests in a year, refuses a test, or is caught possessing drugs.⁴ Revocation can mean months of imprisonment depending on the underlying offense. Family courts also use 5-panel screens during custody disputes.

Prescription Medications and the Medical Review Officer

A positive initial screen does not automatically mean you fail. Many legitimate prescriptions trigger the immunoassay for amphetamines or opioids, and some over-the-counter cold medicines with pseudoephedrine can occasionally produce a presumptive positive for amphetamines.

The Medical Review Officer handles that gap. The MRO is a licensed physician (Doctor of Medicine or Osteopathy) with specialized training in interpreting drug test results.⁵ Before any positive is reported to your employer, the MRO calls you for a confidential interview and lets you explain the result. The MRO can then verify your claim by contacting your prescribing physician, checking with your pharmacy, or requesting further lab analysis to distinguish prescription use from illicit use.⁶

If the MRO confirms a valid prescription explains the result, the test is reported to your employer as negative and the employer never learns what medication you take. But you have to actually respond when the MRO calls. Ignoring those attempts will result in the positive being verified and reported.

The Americans with Disabilities Act adds a layer of protection for people in recovery from opioid use disorder who are taking prescribed medications such as buprenorphine or methadone. Those individuals are not considered “current illegal drug users” under the ADA, and employers generally cannot take adverse action against them solely because a drug test reveals the prescribed medication.⁷

Marijuana Is Still a Positive Under Federal Rules

This is the trap. Even if you live in a state where recreational marijuana is legal, a positive THC result on a federally mandated test is treated the same as any other positive. The DOT has said explicitly that marijuana use remains unacceptable for safety-sensitive employees, regardless of state law, and that applies to off-duty use.⁸ A truck driver who uses marijuana legally on a Saturday in a state that permits it can still lose the job on Monday if the test is positive.

For private employers outside DOT jurisdiction, the picture is more complicated. A growing number of states protect employees from adverse action based on legal off-duty marijuana use, but most of those laws carve out exceptions for safety-sensitive roles or observed on-the-job impairment. No state law overrides a federal testing requirement.

What Collection Day Looks Like

Federally regulated tests use the split-specimen method. After you provide a urine sample, the collector divides it into two bottles in your presence: a primary specimen of at least 30 mL and a split of at least 15 mL.⁹ The collector, not you, pours, seals, and labels the bottles. You initial the tamper-evident seals. The split is stored separately so an independent lab can test it if you challenge a positive.

A chain-of-custody form tracks every person who handles the specimen from collection through final reporting. That paperwork is what gives the result legal weight. If the chain breaks, the result can be invalidated.

Most collections aren’t directly observed. Federal rules require observation in specific situations: return-to-duty and follow-up tests, cases where a prior specimen looked tampered with, specimen temperature outside the accepted range, or an invalid result the MRO couldn’t explain medically.¹⁰ Observed collections use a same-gender observer to prevent substitution or adulteration.

What Happens If You Fail

For DOT-regulated employees, a verified positive means immediate removal from safety-sensitive duties. You can’t return until you’re evaluated by a Substance Abuse Professional, complete any recommended treatment, pass a return-to-duty test, and submit to unannounced follow-up testing under direct observation for at least 12 months.¹¹ Follow-up testing requires a minimum of six tests in the first year and can extend up to 60 months.

DOT rules don’t decide whether you get fired. That’s your employer’s call under its own policy or any applicable collective bargaining agreement. Some employers offer a one-time rehabilitation opportunity; others terminate immediately.

For private-sector workers outside DOT jurisdiction, consequences depend on state law and company policy. Most states allow termination for a confirmed positive, though some require specific procedural steps or an offer of rehabilitation. Requesting a retest of the split specimen is standard practice where available.

Refusing Counts as Failing

Under federal rules, refusing a drug test is treated the same as a positive. The definition of refusal is broader than most people realize. Beyond saying “no,” it includes failing to appear within a reasonable time after being directed to test, leaving the collection site before the process finishes, failing to provide enough urine without a valid medical explanation, possessing a prosthetic device that could interfere with collection, or failing to cooperate with any part of the process.¹²

Refusing a DOT-mandated test triggers the same removal and return-to-duty requirements as a verified positive.¹¹ You’ll need the Substance Abuse Professional evaluation and a passing return-to-duty test before performing safety-sensitive work again.

Expanded Panels and Oral Fluid Testing

The 5-panel is a floor, not a ceiling. Private employers often build on it, adding benzodiazepines (Xanax, Valium), barbiturates, synthetic cannabinoids, methadone, or expanded opioid panels including buprenorphine or tramadol. These are usually labeled 7-, 10-, or 12-panel tests depending on how many classes are included. DOT-regulated employers cannot expand their federally mandated tests: the panel is fixed under 49 CFR Part 40.³ A DOT-covered employer can, however, run a separate non-DOT test with an expanded panel using a different specimen, provided the two are kept fully separate.

The DOT authorized oral fluid (saliva) testing as an alternative to urine in a 2023 rule change, and the 2026 HHS guidelines include a full oral fluid panel with its own cutoffs.² Oral fluid is harder to cheat because collection is directly observed by default. But as of April 2026, no labs have been HHS-certified to conduct oral fluid testing,¹³ and DOT rules require at least two certified labs before employers can use it.¹⁴ Until that certification catches up, urine remains the only authorized specimen for DOT drug testing.

1
eCFR. 49 CFR Part 40 – Procedures for Transportation Workplace Drug and Alcohol Testing Programs
2
Federal Register. Mandatory Guidelines for Federal Workplace Drug Testing Programs – Authorized Testing Panels
3
eCFR. 49 CFR Part 40 Subpart F – Drug Testing Laboratories
4
United States Sentencing Commission. Probation and Supervised Release
5
U.S. Department of Transportation. DOT Rule 49 CFR Part 40 Section 40.121
6
eCFR. How Does the MRO Obtain Information for the Verification Decision
7
ADA.gov. Opioid Use Disorder
8
U.S. Department of Transportation. DOT’s Notice on Testing for Marijuana
9
eCFR. 49 CFR Part 40 Subpart E – Specimen Collections
10
eCFR. 49 CFR 40.67 – Direct Observation
11
U.S. Department of Transportation. Employees
12
eCFR. 49 CFR 40.191 – What Is a Refusal to Take a DOT Drug Test, and What Are the Consequences
13
Federal Register. Current List of HHS-Certified Laboratories and Instrumented Initial Testing Facilities
14
Federal Register. Procedures for Transportation Workplace Drug and Alcohol Testing Programs