October 27, 2015

DWI Detection and Standardized Field Sobriety Testing Session 5 – Phase One: Vehicle in Motion • Erratic movements while going straight • Operating without lights at night • Recklessness • Following too closely • Running stop light or sign • Evasion • Traveling wrong way Motorcycle DUI Detection Guide

DWI Detection and Standardized Field Sobriety Testing
Session 5 – Phase One: Vehicle in Motion
Erratic movements while going straight
Operating without lights at night
Recklessness
Following too closely
Running stop light or sign
Evasion
Traveling wrong way
Motorcycle DUI Detection Guide
Good cues (30 to 50% probability)
5-17
Good Cues (30 to 50% probability)
• Erratic movements while going straight
• Operating without lights at night
• Recklessness
• Following too closely
• Running stop light or sign
• Evasion
• Traveling wrong way
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HS 178 R5/13 13 of 19
DWI Detection and Standardized Field Sobriety Testing
Session 5 – Phase One: Vehicle in Motion
Elements of the Driving Task
5-18
Relationship of Visual Cues to Impaired Divided Attention Capability
Driving is a complex task, composed of many parts:
• Steering
• Controlling accelerator
• Signaling
• Controlling brake pedal
• Operating clutch (if applicable)
• Operating gearshift (if applicable)
• Observing other traffic
• Observing signal lights, stop signs, other traffic control devices
• Making decisions (whether to stop, turn, speed up, slow down, etc.)
• Many other things
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HS 178 R5/13 14 of 19
DWI Detection and Standardized Field Sobriety Testing
Session 5 – Phase One: Vehicle in Motion
Safe driving demands the ability to divide
attention among numerous simultaneous tasks.
Safe Driving Demands
5-19
In order to drive safely, a driver must be able to divide attention among all of these
various activities.
Under the influence of alcohol or many drugs, a person's ability to divide attention
becomes impaired.
The impaired driver tends to concentrate on certain parts of driving and to disregard
other parts.
• Alcohol has impaired ability to divide attention.
• Driver is concentrating on steering and controlling the accelerator and brake.
• Does not respond to the particular color of the traffic light.
Some of the most significant evidence from all three phases of DWI detection can be
related directly to the effects of alcohol and/or other drugs on divided attention ability.
DWI Detection and Standardized Field Sobriety Testing
Session 5 – Phase One: Vehicle in Motion
What do you see?
Moving violation?
Equipment violation?
Other violation?
Unusual operation?
Anything else?
Vehicle In Motion Initial Cues
5-20
D. Recognition and Description of Initial Cues
What do you see?
• Moving violation?
• Equipment violation?
• Other violation?
• Unusual operation?
• Anything else?
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HS 178 R5/13 15 of 19
DWI Detection and Standardized Field Sobriety Testing
Session 5 – Phase One: Vehicle in Motion
Requires the ability to:
Recognize evidence of alcohol and/or
other drug influence
Describe that evidence clearly and
convincingly
Phase One: Task One
Initial Observation of Vehicle Operation
5-21
Phase One: Task One Initial Observation of Vehicle Operation
The task of making initial observations of vehicle operation is the first step in the job of
DWI detection.
Proper performance of that task demands two distinct but related abilities:
• Ability to recognize evidence of alcohol and/or other drug influence.
• Ability to describe that evidence clearly and convincingly.
It is not enough that a police officer observe and recognize symptoms of impaired
driving. The officer must be able to articulate what was observed so that a judge or jury
will have a clear mental image of exactly what took place.
Improving the ability to recognize and clearly describe observational evidence requires
practice.
It isn't practical to have impaired drivers actually drive through the classroom.
The next best thing is to use video to portray typical DWI detection contacts.
DWI Detection and Standardized Field Sobriety Testing
Session 5 – Phase One: Vehicle in Motion
View DWI violation videos
Take notes
Testify
Choose words carefully
Provide as much detail as possible
Construct accurate image of observations
Critique testimony
Procedures for Practicing Cue
Recognition and Description
5-22
Procedures for Practicing Cue Recognition and Description
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HS 178 R5/13 16 of 19
DWI Detection and Standardized Field Sobriety Testing
Session 5 – Phase One: Vehicle in Motion
Leaving the Shopping Center
5-23
DWI Detection and Standardized Field Sobriety Testing
Session 5 – Phase One: Vehicle in Motion
The Charcoal SUV
5-24
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HS 178 R5/13 17 of 19Source: DWI Detection and
Standardized Field
Sobriety Testing

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