The National Highway Traffic Safety Administration (NHTSA) identified 24 cues for police officers to detect nighttime impaired drivers.

24 Initial Visual DWI Detection Cues

1. Weaving
2. Weaving Across Lane Lines
3. Straddling A Lane Line
4. Swerving
5. Turning With Wide Radius
6. Drifting
7. Almost Striking Object or Vehicle
8. Stopping Problems (too far, too short, too jerky)
9. Accelerating Or Decelerating Rapidly
10. Varying Speed
11. Slow Speed (10 m.p.h. + Under Limit)
12. Driving In Opposing Lanes Or Wrong Way On One-Way Street
13. Slow Response to Traffic Signals
14. Slow Or Failure To Respond To Officer's Signal's
15. Stopping in Lane for No Apparent Reason
16. Driving Without Headlights At Night
17. Failure to Signal or Signal Inconsistent with Action
18. Following Too Closely
19. Improper or Unsafe Lane Change
20. Illegal or Improper Turn (too fast, jerky, sharp, etc.)
21. Driving on Other Than Designated Roadway
22. Stopping Inappropriately In Response To Officer
23. Inappropriate Or Unusual Behavior (throwing objects, arguing, etc.)
24. Appearing to be Impaired

The police officer may only have identified one, two, or even three of these cues as part of his probable cause to make the stop. Set an appointment to how this impacts your Missouri DWI case.