October 29, 2015

DWI Detection and Standardized Field Sobriety Testing Walk and Turn Divided Attention Test Mental Task and Physical Task Instructions stage Walking stage

Session 8 - Concepts and Principles of the Standardized Field Sobriety Tests (SFST)
DWI Detection and Standardized Field Sobriety Testing
Walk and Turn
Divided Attention Test
Mental Task and Physical Task
Instructions stage
Walking stage
8-66
E. Walk and Turn
Test Stages
Like all divided attention tests, Walk and Turn has two stages.
They are:
• Instructions Stage
• Walking Stage
Both stages are important, because they can affect the subject's overall performance on
the test.
Notes:_______________________________________________
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HS 178 R5/13 41 of 62
Session 8 - Concepts and Principles of the Standardized Field Sobriety Tests (SFST)
DWI Detection and Standardized Field Sobriety Testing
Walk and Turn
Divided Attention Test
Mental Task and Physical Task
Instructions stage
Walking stage
8-67
Test Conditions
Whenever possible, the Walk and Turn test should be conducted on a reasonably dry,
hard, level, non-slippery surface. There should be sufficient room for subjects to
complete nine heel to toe steps. Recent field validation studies have indicated that
varying environmental conditions have not affected a subject’s ability to perform this
test.
The original SCRI studies suggested that individuals over 65 years of age or people
with back, leg or inner ear problems had difficulty performing this test. Less than 1.5%
of the test subjects in the original studies were over 65 years of age. Also, the SCRI
studies suggest that individuals wearing heels more than 2 inches high should be given
the opportunity to remove their shoes. Officers should consider all factors when
conducting SFSTs.
Session 8 - Concepts and Principles of the Standardized Field Sobriety Tests (SFST)
DWI Detection and Standardized Field Sobriety Testing
Safety Precautions
Keep subject on left side during
demonstrations
Never turn back on subject
Be aware of surroundings
Left handed officers should
demonstrate test at a distance more
than arm’s length
8-68
Procedures for Walk and Turn Testing
Notes:_______________________________________________
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HS 178 R5/13 42 of 62 Source: DWI Detection and
Standardized Field
Sobriety Testing
March 2013 Edition

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