Results from the 2019 Drug and Alcohol Testing Survey [Analysis Brief]
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Summary
This report presents the findings of the 2019 Federal Motor Carrier Safety Administration (FMCSA) Drug and Alcohol Testing Survey, which measures the prevalence of controlled substance and alcohol use among commercial driver’s license (CDL) holders. The study is mandated by Part 382 of the Federal Motor Carrier Safety Regulations, which requires motor carriers to maintain testing programs. In 2019, carriers were required to randomly test 25% of CDL drivers for drugs and 10% for alcohol. Non-random testing is also required for pre-employment screening, post-crash incidents involving fatalities or citations, and reasonable suspicion of impairment. The report aims to provide weighted statistical estimates of positive usage rates, which are used to evaluate industry compliance and inform safety enforcement strategies. The methodology involved sending survey forms to 9,515 randomly selected motor carriers, resulting in 4,022 completed responses. Usable data were obtained from 3,322 carriers covering 352,254 CDL drivers for random drug testing and 3,138 carriers covering 158,820 drivers for random alcohol testing. Estimates were derived using standard statistical techniques for stratified samples, with results presented as unbiased estimates with associated sampling errors. The analysis distinguishes between random testing and non-random testing categories, though precision for non-random categories other than pre-employment and post-crash was insufficient for detailed reporting. The results indicate a notable increase in positive usage rates compared to previous years. For random drug testing, the estimated positive rate in 2019 was 1.6% (95% confidence interval: 1.4%–1.8%), up from 0.8% in 2017 and 1.0% in 2018. Random alcohol violation rates (BAC ≥ 0.04) rose to 0.3% in 2019 (95% confidence interval: 0.2%–0.4%), compared to 0.08% in 2017 and 0.06% in 2018. Non-random testing revealed higher prevalence in specific contexts: the estimated drug usage rate for post-crash testing was 5.8% in 2019, significantly higher than the 1.4% recorded in 2018. Pre-employment drug testing showed a 1.9% positive rate in 2019. Compliance with random testing programs was estimated at 94% for motor carriers and 100% for CDL drivers. These findings highlight a rising trend in drug and alcohol violations among commercial drivers, particularly in post-crash scenarios. In response, FMCSA is coordinating with state partners to enhance traffic enforcement and raise awareness regarding drug-impaired driving. The agency is also leveraging the Drug and Alcohol Clearinghouse, implemented in 2020, to assist carriers in identifying drivers with prior violations during hiring. Additionally, FMCSA proposed rulemaking to prohibit state licensing agencies from issuing CDLs to individuals banned for drug or alcohol violations, aiming to ensure compliance with return-to-duty requirements and improve highway safety.
Key finding
The 2019 survey estimated a 1.6 percent positive drug usage rate and a 0.3 percent alcohol violation rate among commercial drivers, with post-crash drug testing showing a significantly higher rate of 5.8 percent.
Methodology
survey
Sample size: 9515
Provenance
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
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| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 3 | 2026-06-10 |
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| verify | success | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
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- Empirical Findings: observational prevalence