DOT Reasonable Suspicion Supervisor Training
FMCSA 49 CFR §382.603 · 60 min Alcohol Misuse + 60 min Controlled Substance Use · 2 hours total
1. Introduction to Reasonable Suspicion
"Reasonable suspicion" is a specific legal standard in DOT/FMCSA drug and alcohol testing. As a trained supervisor under 49 CFR §382.603, you may be the only person between an impaired driver and a serious accident. Your job is not to diagnose — it is to observe carefully, document objectively, and trigger the testing process when the indicators are there.
What "reasonable suspicion" actually means
Per 49 CFR §382.307, a reasonable suspicion test must be based on specific, contemporaneous, articulable observations concerning the driver's appearance, behavior, speech, or body odors. Each word matters:
- Specific — Not "something seemed off." Concrete observations: red watery eyes, slurred speech, smell of alcohol on the breath, unsteady walking.
- Contemporaneous — Observed at or about the time of the determination. Not "last Tuesday" or "earlier this week."
- Articulable — You can write down what you observed in a way that would hold up to scrutiny. If you can't articulate it, it isn't enough.
- Appearance, behavior, speech, body odors — These are the four categories from the regulation.
Reasonable suspicion vs. other test types
- Random: Computer-generated, no cause required. Driver is in a pool, gets picked.
- Post-accident: Triggered by an FMCSA-qualifying accident (fatality, citation + injury or tow-away). Specific timing requirements.
- Reasonable suspicion: Triggered by your specific observation of indicators of drug or alcohol use. This training prepares you for this type only.
- Pre-employment, return-to-duty, follow-up: Each has its own triggers and rules — not your call as a supervisor in real time.
Why rumors and "gut feelings" are not enough
This is the single most important concept to get right. A coworker saying "I think he's on something" or "everybody knows she drinks" is not reasonable suspicion. Rumors, anonymous complaints, and your own intuition without supporting observations don't meet the legal standard.
What DOES meet the standard is YOUR observation of specific things — what you saw, heard, smelled — at or close to the time you make the determination.
The legal standard, from §382.307(b): "The required observations for alcohol and/or controlled substances reasonable suspicion testing shall be made by a supervisor or company official who is trained in accordance with §382.603. The supervisor or company official who makes the determination that reasonable suspicion exists to conduct an alcohol test shall not conduct the alcohol test of the driver."
The supervisor's role vs. the DER's role
- Supervisor: Observes indicators, makes the reasonable suspicion determination, removes driver from safety-sensitive duty, notifies the DER.
- DER (Designated Employer Representative): Receives the notification, arranges the test, manages MRO communications, applies consequences per company policy.
Note: in many small companies, one person is both the supervisor AND the DER. That's fine. You still follow both roles' procedures.
Remember: Reasonable suspicion is not an accusation of impairment. It's a determination that the indicators warrant a TEST. The test result determines whether the driver was impaired. Your job is to follow the process objectively.
Knowledge check
2. DOT / FMCSA Rule Overview
The two regulations that matter most
- 49 CFR Part 40 — The DOT-wide procedural rule. Covers HOW testing is done across all DOT modes (collection procedures, lab handling, MRO review, consequences).
- 49 CFR Part 382 — The FMCSA-specific rule. Covers WHO must be tested, WHEN, and the supervisor / employer responsibilities specific to motor carriers.
Key §382 sections you should know about
- §382.301 — Pre-employment testing
- §382.303 — Post-accident testing (with specific triggering criteria)
- §382.305 — Random testing
- §382.307 — Reasonable suspicion testing (THIS is the rule you're acting under)
- §382.309 — Return-to-duty testing (observed)
- §382.311 — Follow-up testing (observed)
- §382.601 — Driver education requirement
- §382.603 — Supervisor training (THE COURSE YOU'RE TAKING NOW)
Who is covered
Any driver who operates a Commercial Motor Vehicle (CMV) requiring a Commercial Driver's License (CDL) or Commercial Learner's Permit (CLP) on public roads. That generally means: GVWR ≥ 26,001 lb, OR designed to transport 16+ passengers, OR transporting placardable quantities of hazardous materials.
What "safety-sensitive functions" means
A driver is performing safety-sensitive functions when they are doing any of the following on behalf of the employer:
- Driving the CMV
- Waiting to be dispatched (ready to drive)
- Inspecting, servicing, or conditioning a CMV
- Loading, unloading, or supervising loading/unloading
- Repairing or attending a disabled CMV
- At a carrier's terminal, plant, or other facility for any of the above
Driving home in their personal car? Not safety-sensitive. Dispatch waiting room ready to drive? Safety-sensitive.
Removal from safety-sensitive duty — §382.211 and §382.307(e)
Once reasonable suspicion is established, the driver must be immediately removed from safety-sensitive duty. They can't continue to drive, can't be re-dispatched, can't perform any of the safety-sensitive functions listed above. This is a hard rule.
Alcohol-test timing matters: §382.307 requires the alcohol test to be administered shortly after the determination. If you can't administer within 2 hours, you must document why. After 8 hours, attempts must cease. Drug testing has less time pressure, but should still happen promptly.
Required documentation
The supervisor must document the observations and the resulting test request. Your company retains this record. If a driver later disputes the test, your contemporaneous documentation is the evidence.
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3. Alcohol — How It Affects Performance
Alcohol is a central nervous system depressant. Even at levels well below the legal driving limit for non-CMV drivers (0.08), alcohol meaningfully impairs the abilities a CMV driver needs:
What alcohol impairs
- Judgment — assessing risk, deciding whether to take an evasive action, choosing when to stop
- Reaction time — the time between perceiving a hazard and responding to it; even small amounts can add 100–200ms
- Coordination — steering, shifting, accurately operating equipment
- Tracking and vision — eye movement smoothness, peripheral vision, judging distance
- Vigilance — sustained attention over long stretches of road or warehouse work
- Inhibition — reduces risk-aversion, increases willingness to take chances (speeding, lane changes, ignoring fatigue)
The two DOT BrAC thresholds
Two key things about alcohol indicators
1. Symptoms don't always match BrAC linearly. A driver with high tolerance may show fewer outward signs at the same BrAC than a low-tolerance driver. So absence of obvious symptoms doesn't prove sobriety — but presence of multiple symptoms strongly supports reasonable suspicion.
2. Smell is one indicator but not proof. The smell of alcohol on the breath supports reasonable suspicion alongside other indicators, but the smell alone doesn't prove the driver consumed alcohol (mouthwash, certain medications, dental work can affect it). Document the smell AND the other indicators.
Knowledge check
4. Alcohol — Physical & Speech Indicators
None of these indicators alone proves alcohol misuse. The standard is specific, contemporaneous, articulable observations. The more observations you document, the stronger the reasonable suspicion determination.
Physical indicators
- Odor of alcohol on the breath
- Flushed face / red skin
- Bloodshot or watery eyes
- Poor balance / unsteady walking
- Stumbling, leaning on objects for support
- Poor coordination (e.g., fumbling keys or pen)
- Sweating (without exertion)
- Disheveled appearance (clothes wrinkled, shirt untucked)
- Trouble walking a straight line
- Difficulty focusing eyes
Speech indicators
- Slurred speech
- Loud or unusually animated speech
- Repeating themselves
- Slow responses to questions
- Confused answers
- Rambling, going off on tangents
- Difficulty pronouncing words
- Inappropriate volume (too loud or too quiet)
- Mumbling
- Trouble finding the right words
What you're looking for is a cluster. One indicator alone — say, red eyes — could be allergies, late night, contact lenses, swimming. Two or three together — red eyes + smell of alcohol + slurred speech — paint a clear picture and form the basis of reasonable suspicion.
How to observe well
- Engage the driver in normal conversation. Ask them about their day. This reveals speech patterns and orientation.
- Watch them walk — even a few steps from their truck to the office. Are they unsteady?
- Watch their hands. Are they shaky? Can they grip things normally?
- Note the time and surrounding context. Was it just after a meal? After a known break?
- Take mental notes of EVERYTHING — you'll write it down within the next few minutes.
Knowledge check
5. Alcohol — Behavior & Performance Indicators
Behavioral indicators
- Sudden aggression or argumentativeness
- Unusual friendliness / overly talkative
- Mood swings within a short conversation
- Confusion about familiar tasks or locations
- Sleeping on duty / nodding off
- Poor judgment in decisions
- Unusual risk-taking (e.g., cutting corners on safety)
- Out-of-character emotional outbursts
- Inappropriate humor or laughter
- Hostility toward routine instructions
Performance indicators
- Unsafe driving — drifting, hard braking, near-misses
- Equipment damage (dings, scrapes from poor maneuvering)
- Late deliveries with no good explanation
- Errors in logs, BOLs, or routine paperwork
- Difficulty following multi-step instructions
- Delayed reaction time (e.g., slow to respond to radio)
- Customer or coworker complaints
- Missing scheduled check-ins
- Disorganized or incomplete pre-trip inspection
- Unusually slow loading/unloading work
Looking at the whole picture
Behavioral and performance indicators often surface BEFORE you have a chance to observe physical or speech indicators. A driver who has been showing declining performance, increasing customer complaints, and erratic mood for weeks may not be drinking on the job — they may have a problem at home, sleep apnea, a medical condition. But when those background patterns combine with TODAY's specific observations (smell on breath, red eyes, slurred speech), you have a reasonable suspicion situation.
The "today" rule: Reasonable suspicion is based on CURRENT, contemporaneous observations. You can use background context (this driver has been struggling for weeks) to frame your observations, but the trigger has to be today's specific signs.
Closing the alcohol training
You've completed the 60-minute alcohol misuse portion required by §382.603. Next: 60 minutes on controlled substance use.
Knowledge check
6. Drugs — How They Affect Performance
The DOT 5-panel drug test
The federal DOT drug panel tests for the following substances:
- Marijuana (THC)
- Cocaine
- Amphetamines / Methamphetamines (includes MDMA)
- Opioids (includes codeine, morphine, heroin metabolite, hydrocodone, hydromorphone, oxycodone, oxymorphone)
- Phencyclidine (PCP)
Substances effect behavior very differently
Unlike alcohol — which has a relatively consistent set of indicators — controlled substances vary dramatically. A driver on a CNS stimulant (cocaine, methamphetamine) looks very different from a driver on a CNS depressant (opioid, benzodiazepine). Your job is NOT to identify the substance — your job is to observe and document what you see.
Don't guess the drug. Even an experienced supervisor can't reliably tell what substance someone has used. The lab test does that. You document the observations. The MRO determines whether a positive result is a legitimate medical use or a violation.
General categories of drug effects
- CNS stimulants (cocaine, amphetamines) — May cause hyperactivity, dilated pupils, rapid speech, paranoia, jitteriness, decreased appetite, increased heart rate
- CNS depressants (opioids, benzodiazepines) — May cause drowsiness, constricted (pinpoint) pupils, slow speech, "nodding off," slowed reaction time
- Marijuana / cannabinoids — May cause red/bloodshot eyes, slowed reactions, distorted time perception, increased appetite, characteristic smell
- Hallucinogens (PCP) — May cause confusion, agitation, unpredictable behavior, distorted perception, fixed stare
What this means for your observations
Because indicators vary so much by substance, the indicator categories supervisors are trained to recognize cast a wide net: PHYSICAL signs (pupils, sweating, tremors), BEHAVIORAL signs (paranoia, hyperactivity, secretiveness, drowsiness), SPEECH signs (rapid, slow, incoherent), and PERFORMANCE signs (errors, near-misses, drops in quality).
Knowledge check
7. Drugs — Physical Indicators
Eyes & face
- Dilated (large) pupils
- Constricted (pinpoint) pupils
- Red or glassy eyes
- Droopy eyelids
- Fixed stare or unable to maintain eye contact
- Excessive blinking or eye twitching
- Pale face or extremely flushed face
- Runny nose without explanation
- Disoriented or "out-of-it" appearance
Body
- Tremors / shaking hands
- Excessive sweating (without exertion)
- Unusual fatigue or lethargy
- Hyperactivity / inability to sit still
- Poor coordination
- Slow movement / "moving in slow motion"
- Unusual body odor (chemical, sweet, burnt)
- Burn marks on fingers, hands, or arms
- Stains on clothing
- Scratching at skin / picking
Pupils are diagnostic when extreme. Normal pupils adjust to lighting. Very dilated pupils in normal light, OR pinpoint pupils in dim light, are unusual and may support reasonable suspicion alongside other indicators.
What to do when you see physical indicators
If you see ANY of these in combination with behavioral or performance indicators (next section), or you see multiple PHYSICAL indicators at once, that supports reasonable suspicion. Examples:
- Driver returns from a break with very red eyes, slow movements, the smell of marijuana, and slurred-but-not-mumbled speech
- Driver arrives for shift hyperactive, with very dilated pupils, sweating heavily in 60°F weather, and rapid agitated speech
- Driver appears to fall asleep mid-conversation, has pinpoint pupils, droopy eyelids, and very slow speech
In all three cases, what you describe in your documentation is the OBSERVATIONS — not your guess about which substance.
Knowledge check
8. Drugs — Behavior & Performance Indicators
Behavioral indicators
- Paranoia / suspicious behavior
- Confusion about familiar things
- Anxiety / nervousness
- Euphoria / inappropriate happiness
- Aggression
- Unusual silence / withdrawal
- Irritability over minor things
- Restlessness / can't sit still
- Drowsiness / nodding off
- Mood swings
- Secretive behavior / hiding things
- Inappropriate laughter
- Difficulty focusing on a conversation
Performance indicators
- Unsafe operation of equipment
- Missed steps in routine procedures
- Unexplained errors in work
- Poor attention to surroundings
- Near-misses or close calls
- Vehicle accidents (especially at-fault)
- Failure to follow clear instructions
- Sudden drop in work quality
- Delayed reactions to known signals
- Forgetting routine tasks
- Coming back late from breaks
- Taking unusually long bathroom breaks
Speech indicators specific to drug use
- Rapid speech (stimulants)
- Slurred speech (depressants)
- Slow speech (depressants)
- Incoherent speech
- Repeating answers to questions
- Trouble answering basic questions ("What's today's date?" "Where are you going?")
- Rambling, jumping between topics
- Inappropriate or out-of-context responses
You've completed the 2 required hours
You've now completed the 60 minutes on alcohol misuse (Sections 3–5) and 60 minutes on controlled substance use (Sections 6–8) required by §382.603. The remaining sections cover the practical steps — decision process, documentation, scenarios, and what NOT to do — that turn knowledge into action.
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9. The 8-Step Decision Process
When you observe indicators that may support reasonable suspicion, follow this sequence. Don't skip steps. Don't reorder them. Don't improvise.
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1
Observe
What did you personally see, hear, smell, or notice? Take mental notes of every specific observation. Engage the driver in a brief, neutral conversation to gather more.
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2
Confirm if possible
If another trained supervisor is available, briefly bring them in for a second observation. This isn't required (you can act alone), but a second observer strengthens documentation.
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3
Document — IMMEDIATELY
Write down what you observed. Be specific, factual, time-stamped. Don't wait until the end of the day. Memory fades, details change, and contemporaneous documentation is what defends the determination later.
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4
Remove from safety-sensitive duty
Tell the driver — calmly, professionally — that they're being removed from safety-sensitive duty pending a test. Take possession of keys if needed. Do NOT let them get back in the cab.
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5
Notify the DER
Contact the company's Designated Employer Representative. Brief them on observations + actions taken. If you ARE the DER, you still document the contact as if a different supervisor had observed.
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6
Arrange the test promptly
The DER arranges the test through the company's TPA or designated collection site. Alcohol test should be administered within 2 hours of the determination; if not, document why; after 8 hours, attempts must cease.
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7
Arrange SAFE transportation
The driver canNOT drive themselves to the collection site (that would defeat the entire reason you're testing). Arrange a ride: another sober employee, a taxi, rideshare. Pay for it if needed. Document who transported them.
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8
Keep records
Retain the reasonable suspicion observation form, the supervisor training certificate, the test result (when it comes back), and the DER notification log. Required retention is per §382.401 (1 year for negative/cancelled, 5 years for positive/refusal).
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10. Documenting Observations — Doing It Right
If a driver later disputes the reasonable suspicion test — and they sometimes do — your documentation is the evidence. Good documentation wins disputes. Bad documentation loses them. This is true whether the dispute happens at the company level, with an arbitrator, or in court.
Two ways to write the same situation
Don't write this
"Driver was definitely drunk."
"Driver was acting weird and seemed off."
"Driver looked like he was on drugs."
"Driver was high — I could tell."
Write this
"Driver had slurred speech, smelled of alcohol on the breath, stumbled into the office wall while walking from his truck to the dispatch counter, and had bloodshot/watery eyes at 8:15 AM."
"Driver appeared confused — when asked his route number he said '47' then immediately said '52' then sat silently for 8 seconds before saying he didn't remember. Dropped paperwork on the floor twice."
"Driver observed at 14:20 sleeping in the cab during scheduled duty time. When awakened, had pinpoint pupils, droopy eyelids, very slow speech, and unsteady balance walking to the office."
The four documentation rules
- Be specific. Not "Driver seemed impaired." Instead, list the specific things you observed.
- Stay factual. Write what you saw, heard, smelled. Do NOT write your conclusions ("he was drunk", "he was high", "he was impaired"). Let the test result do that.
- Time-stamp it. When did you make the observation? What time did you talk to the driver? When did the test get ordered?
- Write contemporaneously. Right after the observation — not later. Brain fades, details slip, and contemporaneous records are stronger evidence.
What to put in the Reasonable Suspicion Observation Form
- Date and exact time of observation
- Location of observation
- Driver's full name and employee ID
- Supervisor's name and ID
- Type of suspicion: alcohol, drugs, or both
- Specific physical signs observed (with details)
- Specific speech signs observed
- Specific behavioral signs observed
- Specific performance signs observed
- Body odor (if applicable, with description)
- Witnesses (other employees or supervisors present)
- Action taken (removed from duty, called DER, etc.)
- Time removed from safety-sensitive duty
- Time test was ordered / driver sent
- Who transported the driver to the collection site
- Supervisor signature + date
- DER notification — name and time contacted
- Notes / additional context
Pro tip: Write the form WITH the driver in the room (after you've made the determination, before sending them to the test). It signals seriousness and lets you verify spelling of their name, their employee ID, etc. while details are fresh.
Knowledge check
11. Real-World Scenarios
Read each scenario carefully. Ask yourself: Does reasonable suspicion exist? What observations support it? Should you remove the driver and order testing?
Scenario 1: Alcohol odor before dispatch
A driver arrives for the 6 AM shift. As he walks past you, you smell alcohol on his breath. His eyes look red and a bit watery. When you say good morning, his response is slow and his speech is slightly slurred. He says he had a couple of beers at dinner the night before.
Does reasonable suspicion exist? Yes. You have multiple specific, contemporaneous observations: alcohol smell, red eyes, slow/slurred speech. The driver's explanation ("a couple of beers last night") doesn't change the observations.
What to do: Document the observations, remove him from safety-sensitive duty, notify DER, arrange the alcohol test, arrange transportation. Don't argue with him about how many beers he had.
Scenario 2: Rumor only
A coworker pulls you aside and says, "I'm pretty sure Driver X is using something. He's been acting weird and he's missed two deliveries." You haven't personally observed any indicators with Driver X today. You haven't observed any in the past week either.
Does reasonable suspicion exist? No. A coworker's report alone — even a sincere one — is not specific contemporaneous observation by a trained supervisor. You can't order an RS test on a rumor.
What to do: Document the coworker's report (date, time, who reported, what they said). Increase your own observation of Driver X. If you start seeing indicators yourself, THEN you have a basis. Talk to the DER about the report so they have it on file.
Scenario 3: Post-accident confusion
A driver has just had a single-vehicle accident — slid into a ditch on an icy road, no other vehicle involved, no injuries, vehicle is still drivable but damaged. When you arrive on scene, the driver is shaken, hands trembling, speech a bit fast, eyes wide.
Does reasonable suspicion exist? Probably not — the indicators you're seeing are consistent with a normal stress response to a recent accident. Trembling, fast speech, wide eyes immediately after an accident are not indicators of drug use; they're indicators of having just been in an accident.
What to do: First, check if the accident is FMCSA-qualifying for post-accident testing under §382.303 (fatality? citation + injury or tow-away?). If yes, post-accident testing applies — that's a different category from reasonable suspicion. If the accident is NOT a qualifying post-accident trigger, observe the driver for 10–15 minutes as they calm down. If indicators persist (slurred speech that has nothing to do with stress, smell of alcohol, etc.), reasonable suspicion may apply.
Scenario 4: Strong marijuana odor on return from break
A driver returns from a 30-minute lunch break smelling strongly of marijuana. His eyes are red. His responses to your questions are slow and he seems to be having trouble focusing on the conversation. He's about to take the truck back out for the afternoon route.
Does reasonable suspicion exist? Yes. The smell + red eyes + slow responses + difficulty focusing form a textbook cluster. State legality of marijuana does NOT change federal CMV rules — DOT drivers are subject to federal prohibition regardless of state law.
What to do: Document, remove from safety-sensitive duty, notify DER, order a controlled substance test, arrange transportation. Don't get into a debate about state legality.
Scenario 5: Fatigue vs. drug suspicion
A driver who just finished a long route is tired. He's yawning, his eyes look heavy, his speech is slow, and he's a little slow to respond. He doesn't smell of alcohol, his pupils look normal-sized, and he's coherent — just clearly tired.
Does reasonable suspicion exist? Probably not — what you're observing is consistent with fatigue, which is a different problem from drug or alcohol use. Fatigue is a safety issue under hours-of-service rules but it's not reasonable suspicion under §382.307.
What to do: Document the fatigue (it's relevant to hours-of-service compliance and you don't want this driver getting another route). Don't order an RS test — you don't have the indicators that support one. Take care of the driver, follow HOS rules, send them home if needed.
Knowledge check
12. What You Should NOT Do
Most reasonable suspicion situations that get challenged or thrown out failed because the supervisor did one of these things. Don't be that supervisor.
- Don't diagnose the substance. Don't write "the driver was on cocaine" or "the driver was drunk." You document observations. The lab and the MRO determine substances and impairment.
- Don't accuse. Avoid saying "I think you're drunk" or "You're high, aren't you?" Stay professional. Say something like: "Based on what I've observed, I need to order a reasonable suspicion drug/alcohol test. I'm removing you from driving duty until the test is complete."
- Don't search. Don't go through the driver's personal belongings, their truck cab, their locker. That's a privacy and labor-law minefield. Document what you observed; let the test do its job.
- Don't ask medical questions beyond safety. Don't ask about specific medications, medical history, or what the driver took. Asking "Are you OK to drive?" is fine. Asking "What pills did you take?" is not.
- Don't let them drive themselves to the test. Major safety + liability issue. Arrange transportation.
- Don't delay testing. Even if there's a tight delivery deadline, even if the driver promises they're fine — the regulations are clear that the test must be administered promptly. Delay defeats the entire purpose of reasonable suspicion testing.
- Don't base testing on rumors. A coworker's report is not specific observation by a trained supervisor. Document the report, increase your own observation, but don't order a test on a rumor.
- Don't use RS as punishment. Reasonable suspicion testing is a safety procedure, not a disciplinary tool. Don't order an RS test because you're mad at a driver, because they questioned your authority, or because you want to "send a message."
- Don't ignore signs because the company is busy. Schedule pressure is the most common reason supervisors fail to act. The accident risk doesn't go down because the company has a tight day.
- Don't broadcast it. Discuss the situation only with people who need to know: the DER, your direct manager if applicable, the collection site. Don't talk about it with other drivers or in front of customers. Confidentiality protects the driver AND protects the company from defamation exposure.
You're ready
You've completed all 12 sections of the DOT Reasonable Suspicion Supervisor Training. You've covered:
- The legal standard and the supervisor's role
- The DOT/FMCSA regulatory framework
- 60 minutes on alcohol misuse — effects, indicators, BrAC thresholds
- 60 minutes on controlled substance use — effects, indicators by category
- The 8-step decision process from observation to test
- How to document objectively
- Real-world scenarios
- The mistakes to avoid
Next: the final test — 25 questions, you need 80% to pass. Pass it once and your audit-ready certificate with QR-coded verification URL is issued immediately. The certificate documents that you completed the §382.603 requirement and is publicly verifiable for as long as your company keeps it on file.
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Final Test
You've made it! Below are 25 questions covering the full §382.603 material. Once you submit, your score is calculated and — if you pass — your audit-ready certificate is generated immediately with a unique verifiable cert ID and QR-coded verification URL.