TruckCodex

392.4A-UI — Use of drugs

FMCSA violation code under Controlled Substances/Alcohol. 186 events recorded in roadside inspections. Severity weight: 10.

Severity Weight
10
OOS Eligible
No
BASIC Category
Controlled Substances/Alcohol
Total Events
186
Code
392.4A-UI
Code System
FMCSR
BASIC Category
Controlled Substances/Alcohol
OOS Eligible
No
Severity Weight
10
Violation Group
—
Total Events
186
Carriers Cited
180

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 392.4A-UI 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).

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 392.4A in the Federal Motor Carrier Safety Regulations.

View on eCFR.gov →FMCSA Violations Search →
Events (all time)
186
OOS Events
184
OOS Rate
98.9%
Top State (180d)
Iowa
25 events

Top Enforcing States

Where 392.4A-UI is most commonly cited (last 180 days)

1.Iowa
25
OOS 96.0%
2.North Carolina
4
OOS 100.0%
3.Illinois
3
OOS 100.0%
4.New Mexico
3
OOS 100.0%
5.Texas
3
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 392.4A-UI citations. Red bars mark months with OOS-triggering citations.

21
May
8
Jun
13
Jul
7
Aug
5
Sep
9
Oct
9
Nov
8
Dec
5
Jan
6
Feb
6
Mar

Most Active Stations

Inspection stations citing 392.4A-UI most often (last 180 days)

1.ANTHONY PORT OF ENTRY
3
OOS 100.0%
2.45 - HWY 218 NB MM 29 PILOT GR
3
OOS 100.0%
3.10 - I35 NB MM 30 OSCEOLA
3
OOS 100.0%
4.15 - I380 NB MM 51 BRANDON
2
OOS 50.0%
5.HWY 61
1
OOS 100.0%
6.I-380 NB SCALE
1
OOS 100.0%
7.80
1
OOS 100.0%
8.I-57 N/B
1
OOS 100.0%
9.MT. AIRY WEIGH STATION S
1
OOS 100.0%
10.STATESVILLE
1
OOS 100.0%

Often Cited Together

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

393.48A9 co-occurrences392.4A-POS9 co-occurrences395.8E8 co-occurrences395.24C2III7 co-occurrences393.95A5 co-occurrences392.2RG4 co-occurrences393.93 co-occurrences395.8A-ELD3 co-occurrences383.23A23 co-occurrences392.2C3 co-occurrences

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

Top Carriers Cited

Ranked by frequency • 180 carriers total • Page 1 of 8

Top Carriers with 392.4A-UI Violations

Showing 25 of 180

fmcsa-violations
Top Carriers with 392.4A-UI Violations
#CarrierUSDOT# Violations
#1MOB CARRIERS INC20784842
#2BIG LEAGUE MOVERS INC19993182
#3ROYAL TRUCKING COMPANY636692
#4LIA EXPRESS INC29978282
#5CONSUMING FIRE ENTERPRISES INC8740742
#6VALCAM EXPRESS CORPORATION34938172
#7MS FREIGHT CO INC20903561
#8VALLEY EXPRESS INC1892471
#9BONNIE'S BARRICADES INC5354401
#10EASTRANS INC23698511
#11SUMMA LOGISTICS INC28762801
#12NS 021 TRANSPORT INC35711711
#13JNZ TRUCKING LLC42002771
#14HAMMES TRUCKING LLC11181631
#15WILD WEST EXPRESS INC5361111
#16MORE SOLUTIONS LLC42814651
#17DEEP SOUTH TRUCKING LLC12955011
#18ROBERT E PARKS JR7382421
#19KDC EXPRESS LLC39714761
#20BIG LEVEL TRUCKING INC7217041
#21SEMPER FI EXPRESS LLC18533781
#22G2 INDUSTRIES LLC29654041
#23M SHINN TRUCKING INC22475841
#24BETTER WAYZ HAULING LLC44708881
#25J&MP TRANSPORT LLC28670131

Recent Inspections

Latest inspections where 392.4A-UI was cited • 186 total events • Page 1 of 8

Recent Inspections with 392.4A-UI

Showing 25 of 186

fmcsa-inspections
Recent Inspections with 392.4A-UI
DateReport #StateLevelOOS
Mar 31, 202687477670ILLevel 1Yes
Mar 27, 202687432766NMLevel 2Yes
Mar 20, 202687371058IALevel 1Yes
Mar 19, 202687371008IALevel 2Yes
Mar 2, 202687189022NCLevel 3Yes
Mar 1, 202687190033NMLevel 2Yes
Feb 27, 202687181021IALevel 3Yes
Feb 23, 202687130174ILLevel 1Yes
Feb 19, 202687098645NCLevel 3Yes
Feb 18, 202687088328NCLevel 3Yes
Feb 16, 202687078292IALevel 3Yes
Feb 16, 202687064264IALevel 2Yes
Jan 30, 202686937862IALevel 3Yes
Jan 26, 202686923025IALevel 2Yes
Jan 13, 202686839691IALevel 3Yes
Jan 9, 202686767337IALevel 3Yes
Jan 8, 202686750309NMLevel 1Yes
Dec 29, 202586676558IALevel 3Yes
Dec 23, 202586664477IALevel 3Yes
Dec 20, 202586630265NCLevel 3Yes
Dec 16, 202586606013TXLevel 2Yes
Dec 15, 202587234590ILLevel 2Yes
Dec 13, 202587190451IALevel 3No
Dec 5, 202586507501IALevel 2Yes
Dec 2, 202586470871IALevel 3Yes

Data sources & freshness

FMCSA Vehicle Inspections and Violations
Unknown freshness
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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