TruckCodex

392.4(a) — Use of drugs

FMCSA violation code under Controlled Substances/Alcohol. 3,919 events recorded in roadside inspections. Severity weight: 10. Out-of-service eligible.

OOS Eligible
Severity Weight
10
OOS Eligible
Yes
BASIC Category
Controlled Substances/Alcohol
Total Events
3,919
Code
392.4(a)
Code System
FMCSR
BASIC Category
Controlled Substances/Alcohol
OOS Eligible
Yes
Severity Weight
10
Violation Group
BASIC 4
Total Events
3,919
Carriers Cited
3,057

Violation Description

Driver or operator of a commercial motor vehicle found to be under the influence of or using a controlled substance or any substance that renders the driver incapable of safely operating the CMV.

About This Violation Code

Code 392.4(a) falls under the Controlled Substances/Alcohol BASIC category in FMCSA's Safety Measurement System (SMS). It carries a severity weight of 10 (scale 1-10, higher = more severe). This violation is Out-of-Service eligible, meaning the driver or vehicle may be placed out of service at roadside when cited.

When this violation is cited during a roadside inspection, it contributes to the carrier's Controlled Substances/Alcohol BASIC score. Carriers with high BASIC percentiles may be prioritized for FMCSA interventions including warning letters, investigations, or compliance reviews.

Regulatory Reference

Federal Motor Carrier Safety Regulations

This violation references 49 CFR 392.4 in the Federal Motor Carrier Safety Regulations.

View on eCFR.gov →FMCSA Violations Search →
Events (all time)
3,919
OOS Events
3,797
OOS Rate
96.9%
Top State (180d)
Illinois
47 events

Top Enforcing States

Where 392.4(a) is most commonly cited (last 180 days)

1.Illinois
47
OOS 91.5%
2.Texas
8
OOS 100.0%

Click a state to see roadside inspection activity, top stations, and carrier profiles in that jurisdiction.

Citation Trend (12 months)

Monthly count of 392.4(a) citations. Red bars mark months with OOS-triggering citations.

3
Apr
12
May
4
Jun
9
Jul
13
Aug
6
Sep
9
Oct
9
Nov
12
Dec
9
Jan
10
Feb
11
Mar

Most Active Stations

Inspection stations citing 392.4(a) most often (last 180 days)

1.80
6
OOS 83.3%
2.I-55
4
OOS 100.0%
3.I-80
3
OOS 66.7%
4.39
3
OOS 100.0%
5.I55
2
OOS 100.0%
6.I-80 EB
2
OOS 100.0%
7.I-74
2
OOS 50.0%
8.SEE LITERAL DESCRIPTION FIELD
2
OOS 50.0%
9.060 - MOLINE - I-74/280 E/B
1
OOS 100.0%
10.I-57 SOUTH
1
OOS 100.0%

Often Cited Together

Other violations commonly found on the same inspection (last 90 days)

392.2RG8 co-occurrences390.21TB6 co-occurrences395.8A-ELD5 co-occurrences396.17C4 co-occurrences393.95A4 co-occurrences383.23A23 co-occurrences393.433 co-occurrences392.2MI3 co-occurrences395.8E2 co-occurrences392.2UCR2 co-occurrences

Citation patterns suggest related root causes (e.g., HOS violations paired with logbook errors).

Top Carriers Cited

Ranked by frequency • 3,057 carriers total • Page 1 of 123

Top Carriers with 392.4(a) Violations

Showing 25 of 3,057

fmcsa-violations
Top Carriers with 392.4(a) Violations
#CarrierUSDOT# Violations
#1WESTERN EXPRESS INC51141215
#2HOME EXPRESS DELIVERY SERVICE LLC27147019
#3BIG LEAGUE MOVERS INC19993188
#4TRANSAM TRUCKING INC3155037
#5NEW PRIME INC37067
#6NORTON TRANSPORT INC9251296
#7PREFERRED RECEIVING AND INSTALLATION INC31954385
#8PENSKE TRUCK LEASING CO LP3275745
#9PT LOGISTICS LLC43660935
#10D G LOGISTICS LLC8525875
#11SEABULK SHIPPING SUPPLY LLC39994435
#12ATLAS VAN LINES INC1255505
#13REDDING CONTRACTORS INC40250815
#14XBC LOGISTICS LLC39957705
#15BROWN'S MOVING AND STORAGE INC13915715
#16GLOBAL LOGISTICS AND CONSULTING LLC41528134
#17ATS SPECIALIZED INC6060564
#18MARTEN TRANSPORT LTD744324
#19CSC SERVICEWORKS INC9984244
#20WORLDWIDE RUNNERS LLC40666904
#21TRUCKIN' MOVERS CORPORATION2339524
#22CHESAPEAKE BAY MOVERS INC25273844
#23GYM-WORX LLC41151644
#24ALCO HAULING LLC35706134
#25APRO TRANSPORT CO28007854

Recent Inspections

Latest inspections where 392.4(a) was cited • 3,919 total events • Page 1 of 157

Recent Inspections with 392.4(a)

Showing 25 of 3,919

fmcsa-inspections
Recent Inspections with 392.4(a)
DateReport #StateLevelOOS
Mar 30, 202687453684ILLevel 3Yes
Mar 22, 202687371976ILLevel 3Yes
Mar 13, 202687371748ILLevel 2No
Mar 13, 202687372312ILLevel 2Yes
Mar 13, 202687372202ILLevel 2Yes
Mar 13, 202687371868ILLevel 1No
Mar 12, 202687371733ILLevel 1Yes
Mar 10, 202687371936ILLevel 3Yes
Mar 9, 202687371747ILLevel 1Yes
Feb 22, 202687139520ILLevel 3Yes
Feb 19, 202687118545TXLevel 1Yes
Feb 18, 202687101167ILLevel 3Yes
Feb 17, 202687078360ILLevel 2Yes
Feb 12, 202687043223ILLevel 2Yes
Feb 10, 202687017594ILLevel 2Yes
Feb 10, 202687031598ILLevel 3Yes
Feb 10, 202687017755ILLevel 3Yes
Feb 9, 202687006454ILLevel 1Yes
Feb 2, 202686979075ILLevel 3Yes
Jan 21, 202686883360ILLevel 2Yes
Jan 19, 202686883140ILLevel 1Yes
Jan 18, 202686884241ILLevel 3Yes
Jan 14, 202686807633TXLevel 2Yes
Jan 14, 202686854537ILLevel 2Yes
Jan 13, 202686843145TXLevel 2Yes

Data sources & freshness

FMCSA Vehicle Inspections and Violations
Updated 3 months ago
Federal Motor Carrier Safety Regulations (49 CFR)
Unknown freshness

Related records

CategoryAll Controlled Substances/Alcohol Violations
Browse all violation codes in the Controlled Substances/Alcohol BASIC
IndexAll Violation Codes
FMCSR violation codes by BASIC category
ReferenceFMCSA Roadside Inspections
Inspection levels and procedures
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