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