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

DWI Detection and Standardized Field Sobriety Testing

Session 7 – Phase Three: Pre-Arrest Screening

• Information processing

• Short term memory

• Judgment/Decision making

• Balance

• Steady, sure reactions

• Clear vision

• Small muscle control

• Coordination of limbs

Typical Simultaneous Capabilities

Required for Driving

7-14

Typical simultaneous capabilities required for driving:

• Information processing

• Short term memory

• Judgment and decision making

• Balance

• Steady, sure reactions

• Clear vision

• Small muscle control

• Coordination of limbs

Any test that requires a person to demonstrate two or more of these capabilities

simultaneously is potentially a good psychophysical test.

DWI Detection and Standardized Field Sobriety Testing

Session 7 – Phase Three: Pre-Arrest Screening

Field sobriety tests should be reasonably

simple for the average person like you, the

jurors, the judge and the suspect to

complete as instructed when sober

Simplicity

7-15

Simplicity is the key to divided attention field sobriety testing. It is not enough to select a

test that just divides the subject's attention. The test also must be one that is reasonably

simple for the average person to complete as instructed when sober. Tests that are

difficult for a sober subject to perform have little or no evidentiary value.

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HS 178 R5/13 10 of 26

Source: DWI Detection and

Standardized Field

Sobriety Testing

March 2013 Edition