Table 4

Parameters Associated With a Typical Field Sobriety test

Breath odor of ethanolVery strong, strong, moderate, faint, none
AttitudeExcited, hilarious, talkative, carefree, sleepy, profanity, combative, indifferent, insulting, cocky, cooperative, polite
Unusual actionsHiccups, belching, vomiting, fighting, crying, laughing
SpeechNot understandable, muffled, slurred, mush mouthed, confused, thick tongued, stuttered, accent, fair, good
EyesWatery, pupil dilated, bloodshot, red eyelids, apparently normal
BalanceFalling, needing support, wobbling, swaying, unsure, fair, sure
Horizontal gaze, nystagmus (i.e., smooth pursuit)a. Pencil held horizontally 12–15 inches from nose
b. Over 6 seconds, move pencil to the extreme left and right of eye field, repeat × 2
c. Subject observed for “lack of smooth pursuit” (i.e., no jerking or tremor eyeball)
d. Jerk at maximum deviation
e. Hold pencil at maximum for 4 seconds and observe for jerking toward center
Reaction to lightIf no drugs are present, the pupils should constrict within 1 second after penlight beam strikes the eye
Balance (walk and turn)a. Read instructions (don't start until instructions are finished)
b. Rated as follows: starts too soon or cannot keep balance
c. Walking stage (rate 1st 9 steps and 2nd 9 steps)
d. Rated as follows: misses heel to toe, steps off imaginary line, raises arms, number of steps taken
One-leg standa. Stand for 30 seconds with the left foot raised 6 inches off the ground
b. Rated at 0–10, 11–20, 21–30 seconds for: swaying, raising arms, hopping, foot down
Quality of the speech (say the ABCs)Slurred or thickened speech
Finger-to-noseAssess motor coordination
Finger countCounting fingers then touching thumb forward and backward
Counting backwardAssess thought processes and concentration