October 29, 2015

DWI Detection and Standardized Field Sobriety Testing Session 7 – Phase Three: Pre-Arrest Screening

Participant Manual SFST - Session 7- Phase Three: Pre-Arrest Screening
DWI Detection and Standardized Field Sobriety Testing
Session 7 – Phase Three: Pre-Arrest Screening
Session 7
Phase Three:
Pre-Arrest Screening
40 Minutes
DWI Detection and Standardized Field Sobriety Testing
Session 7 – Phase Three: Pre-Arrest Screening
Describe the role of psychophysical and
preliminary breath tests
Define and describe the concepts of
divided attention and nystagmus
Discuss the advantages and limitations
of preliminary breath testing
Discuss the arrest decision process
Learning Objectives
7-2
At the conclusion of this session, participants will be able to:
• Describe the role of psychophysical and preliminary breath tests;
• Define and describe the concepts of divided attention and nystagmus;
• Discuss the advantages and limitations of preliminary breath testing; and
• Discuss the arrest decision process.
CONTENT SEGMENTS LEARNING ACTIVITIES
A. Overview: Tasks and Decision Instructor Led Presentation
Gaze Nystagmus - Definition Instructor Led Demonstrations
B. Horizontal Gaze Nystagmus – Definition, Video Presentation
Concepts, Demonstration
C. Vertical Gaze Nystagmus – Definition,
Concepts, Demonstration
D. Divided Attention Tests: Concepts,
Examples, Demonstration
E. Advantages and Limitations of Preliminary
F. Breath Testing
G. The Arrest Decision
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HS 178 R5/13 2 of 26
DWI Detection and Standardized Field Sobriety Testing
Session 7 – Phase Three: Pre-Arrest Screening
Phase Three:
Pre-Arrest Screening
Should
I Arrest?
?
Field Sobriety
Testing
Preliminary
Breath Testing
7-3
A. Overview: Tasks and Decision
Like Phases One and Two, DWI Detection Phase Three, Pre-arrest Screening has two
major evidence gathering tasks and one major decision.
Phase Three: Pre-Arrest Screening
Your first task in Phase Three is to administer three scientifically validated Standardized
Field Sobriety Tests. If your agency uses preliminary breath tests (PBTs), your second
task would be to administer (or arrange for) a PBT to confirm the chemical basis of the
subject's impairment. Based on these tests and on all other evidence from Phase One
and Two, you must decide whether there is sufficient probable cause to arrest the
subject for DWI. The entire detection process culminates in the arrest/no arrest
decision.
DWI Detection and Standardized Field Sobriety Testing
Session 7 – Phase Three: Pre-Arrest Screening
Methods of Assessing Driver’s Mental and
Physical Impairment
Focus on balance, coordination,
information processing, etc.
Observed as soon as face to face contact
and begin the interview
Additional indicators observed as the
driver exits
SFST tests are most scientifically reliable
Psychophysical Tests
7-4
Psychophysical tests are methods of assessing a subject's mental and physical
impairment. These tests focus on the abilities needed for safe driving: balance,
coordination, information processing and so on.
Indicators of psychophysical impairment may be observed as soon as you come into
face to face contact with the subject and begin the interview. Additional indicators of
impairment can be observed as the subject exits the vehicle to begin the field sobriety
tests. The Standardized Field Sobriety Tests are the most scientifically reliable.
Notes:_______________________________________________
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HS 178 R5/13 3 of 26Source: DWI Detection and
Standardized Field
Sobriety Testing
March 2013 Edition

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