Massachusetts DWI DUI OUI Field Sobriety Test Police Training Manual

3. Test Interpretation

You may observe a number of different behaviors when a suspect performs this test. Original research demonstrated that the behaviors listed below are likely to be observed in someone with a BAC above 0.10. Look for the following clues each time this test is given:

A. Cannot keep balance while listening to the instructions. Two tasks are required at the beginning of this test. The suspect must balance heel-to-toe on the line, and at the same time, listen carefully to the instructions. Typically, the person who is impaired can do only one of these things. The suspect may listen to the instructions, but not keep balance. Record this clue if the suspect does not maintain the heel-to-toe position throughout the instructions. (Feet must actually break apart.) Do not record this clue if the suspect sways or uses the arms to balance but maintains the heel-to-toe position.

B. Starts before the instructions are finished. The impaired person may also keep balance, but not listen to the instructions. Since you specifically instructed the suspect not to start walking “until I tell you to begin,” record this clue if the suspect does not wait.

C. Stops while walking. The suspect pauses for several seconds. Do not record this clue if the suspect is merely walking slowly.

D. Does not touch heel-to-toe. The suspect leaves a space of more than one- inch between the heel and toe on any step.

E. Steps off the line. The suspect steps so that one foot is entirely off the line.

Procedures for One-Leg Stand Testing

1. Instructions Stage: Initial Positioning and Verbal Instructions
Initiate the test by giving the following verbal instructions, accompanied by demonstrations.

• “Please stand with your feet together and your arms down at the sides, like this.” (Demonstrate)

• “Do not start to perform the Lest until I tell you to do so.”

• “Do you understand the instructions so far?” (Make sure suspect indicates understanding.)

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