MA Police Training Manual - OUI Stop Field Sobriety Tests
PRE-ARREST SCREENING
PHASE THREE 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
IS THERE PROBABLE
CAUSE TO ARREST
THE SUSPECT FOR DWI?
Your first task in Phase Three is to
administer three scientifically validated psychophysical (field) sobriety tests.
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 driver for DWI.
Your second task may then be to administer (or arrange for) a preliminary breath
test (PBT) to con firm the chemical basis of the driver’s impairment, if your
agency uses PBTs. The entire detection process culminates in the arrest/no
arrest decision.
PSYCHOPHYSICAL TESTSPsychophysical tests are methods of assessing a
suspect’s mental and physical impairment. These tests focus on the abilities
needed for safe driving: balance, coordination, information processing and so
on.
Psychophysical testing actually begins as soon
as you come into face-to-face contact with the suspect and begin the interview
Psychophysical testing continues as the suspect steps from the vehicle and you
observe the manner of the exit
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