Massachusetts DWI DUI OUI Field Sobriety Test Police Training Manual

MAJOR TASKS AND DECISIONS

Each detection phase usually involves two major tasks and one major decision
(See Exhibit 4-2.)

EXHIBIT 4-2

DWI DETECTION PHASES

PHASE ONE:
Vehicle In Motion

SHOULD I
STOP THE VEHICLE?

PHASE TWO:
Personal Contact

SHOULD THE DRIVER EXIT?

PHASE THREE:
Prearrest Screening

IS THERE PROBABLE
CAUSE TO ARREST
THE SUSPECT FOR DWI?

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