NRCME Drug Abuse and Alcoholism 4 — Questions and Answers
Question 1: A commercial driver reports taking tramadol prescribed by their physician for back pain. How should the medical examiner address this?
- Disqualify the driver because tramadol is a Schedule IV opioid-like analgesic affecting alertness (Correct answer)
- Certify the driver if the physician states it does not impair driving
- Allow driving only on local routes without highway access
- Disqualify only if the tramadol dose exceeds 100 mg daily
Correct answer: Disqualify the driver because tramadol is a Schedule IV opioid-like analgesic affecting alertness
Tramadol is a Schedule IV controlled substance with CNS-depressant and opioid-like properties that would disqualify a CMV driver under FMCSA advisory criteria.
Question 2: Which finding on liver function tests is most suggestive of alcoholic liver disease in a CMV driver being evaluated?
- AST:ALT ratio greater than 2:1 (Correct answer)
- Isolated alkaline phosphatase elevation
- Low serum albumin with normal transaminases
- Elevated direct bilirubin with normal AST and ALT
Correct answer: AST:ALT ratio greater than 2:1
An AST:ALT ratio greater than 2:1 is a classic pattern seen in alcoholic liver disease due to alcohol's toxic effect on mitochondria elevating AST disproportionately.
Question 3: Under DOT regulations, which party is responsible for verifying that a covered employee has completed the SAP process before returning to safety-sensitive duty?
- The employer, who must receive written documentation from the SAP (Correct answer)
- The Medical Review Officer (MRO), who certifies return-to-duty fitness
- The driver, who self-reports completion to the FMCSA
- The testing laboratory, which notifies the employer automatically
Correct answer: The employer, who must receive written documentation from the SAP
The employer bears the legal responsibility to receive and verify the SAP's written documentation before allowing the driver to resume safety-sensitive functions.
Question 4: What is the cutoff concentration for a confirmed positive THC (marijuana) result on a DOT urine drug test?
- 15 ng/mL on GC-MS confirmatory testing (Correct answer)
- 50 ng/mL on immunoassay with no confirmatory cutoff
- 25 ng/mL on immunoassay, confirmed at 50 ng/mL
- 10 ng/mL on any validated testing method
Correct answer: 15 ng/mL on GC-MS confirmatory testing
DOT requires an initial immunoassay screen at 50 ng/mL, with GC-MS confirmation at 15 ng/mL to report a positive result.
Question 5: A driver tells the medical examiner they stopped drinking alcohol 3 months ago after a DUI conviction. Which evaluation approach is most appropriate?
- Obtain collateral history, review records, and consider specialist evaluation before certifying (Correct answer)
- Accept self-report and certify if no current clinical diagnosis of alcoholism
- Automatically disqualify due to DUI history regardless of sobriety duration
- Certify for 6 months provisionally and retest at that visit
Correct answer: Obtain collateral history, review records, and consider specialist evaluation before certifying
A recent DUI with only 3 months of self-reported sobriety warrants thorough evaluation including collateral records and possible specialist referral before certification.
Question 6: Which drug of abuse most commonly produces horizontal gaze nystagmus (HGN) detectable during a standard neurological examination?
- Alcohol and PCP (phencyclidine) (Correct answer)
- Marijuana and cocaine
- Heroin and methamphetamine
- Benzodiazepines and opioids
Correct answer: Alcohol and PCP (phencyclidine)
Alcohol and PCP are the substances most reliably associated with horizontal gaze nystagmus, which is why HGN is a standard roadside sobriety test.
Question 7: A driver's random drug test returns positive for cocaine metabolites. The driver claims they used numbing gel containing benzocaine at the dentist. How should this claim be evaluated?
- Reject the explanation because benzocaine does not produce cocaine metabolites detected by DOT testing (Correct answer)
- Accept the explanation as a valid medical alternative and report as negative
- Request a dental office confirmation letter before reporting
- Order a hair follicle test to confirm cocaine use
Correct answer: Reject the explanation because benzocaine does not produce cocaine metabolites detected by DOT testing
Benzocaine is a local anesthetic that does not produce benzoylecgonine, the specific cocaine metabolite measured in DOT testing; this explanation is pharmacologically invalid.
NRCME Drug Abuse and Alcoholism 4
A commercial driver reports taking tramadol prescribed by their physician for back pain.
How should the medical examiner address this?