Alcohol/Drug Detection Guide


Driver Observations

Chances in 100 of nighttime driver with BAC equal to or greater than 0.10%

Driver Error %
Turning with wide radius 65
Straddling center or lane marker 65
Appearing to be drunk 60
Almost striking object or vehicle 60
Weaving 60
Driving on other than designated road 55
Swerving 55
Slow speed (Over 10 m.p.h. below posted speed) 50
Following to closely 50
Drifting 50
Tires on center or lane marker 45
Breaking erratically 45
Driving into opposing / crossing traffic 45
Signaling inconsistent with actions 40
Slow response to traffic signals 40
Stopping inappropriately 35
Turning abruptly or illegally 35
Accelerating or decelerating rapidly 30
Headlights off 30

Next: "Controlled Substances & Indicators ":

Previous: High Risk Traffic Stop Procedure

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