MA Police Training Manual - OUI Stop Field Sobriety Tests
Based on the original
research, if you observe four or more clues it is likely that
the suspect’s BAC is above 0.10. Using this criterion you will be able to
classify about 77% of your suspects accurately. This was determined during
laboratory and field testing and helps you weigh the various field sobriety
tests in this battery as you make your arrest decision.
Vertical Gaze
Nystagmus
The Vertical Gaze
Nystagmus test is simple to administer. During the Vertical Gaze
Nystagmus test, look for jerking as the eyes move up and are held for
approximately four seconds in the upmost position.
1. Position the
stimulus horizontally, about 12—15 inches in front of the suspect’s
nose.
2. Instruct the suspect to hold the head still, and follow the object with the
eyes only.
3. Raise the object until the suspect’s eyes are elevated as far as possible.
4. Hold for approximately four seconds.
5. Watch closely for evidence of jerking.
Horizontal and Vertical Gaze Nystagmus can be observed directly and do not
require special equipment. You will need a contrasting stimulus for the suspect
to follow with their eyes. This can be the tip of your index finger, penlight,
or pen. The stimulus used should be held slightly above eye level, so that the
eyes are wide open when they look directly at it. It should be held
approximately 12— 15 inches in front
of the nose. Remain aware of your position in relation to the suspect at all
times.
OFFICER SAFETY IS THE NUMBER ONE
PRIORITY ON ANY
TRAFFIC STOP.
Procedures for Walk-and-Turn Testing
1. Instruct ions Stage: Initial
Positioning and Verbal Instructions
For standardization in the performance of this test, have the suspect assume
the heel-to-toe stance by giving the following verbal instructions, accompanied
by demonstrations:
Previous |
Next
---
Call Russell Matson's cell phone to talk to a drunk driving / DUI / OUI attorney anytime at (781)380-7730.
|
