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The Police Officer as DUI Expert

The Police Officer as DUI Expert

Information courtesy of Lawrence Taylor - DUIblog

The drunk driving case rests heavily upon the subjective opinions of the arresting officer -- the abilities of that officer to correctly assess DUI symptoms of intoxication: observations of driving, personal symptoms (slurred speech, flushed face, etc.), answers to questions, performance on field sobriety tests. It is his DUI report (and his opinion in that report) which will largely determine what, if any, criminal charges will be filed by the prosecutor; his decision which will or will not result in a suspension of the drivers license; his testimony at trial which will largely decide the guilt or innocence of the person he arrests.

Just how expert is the average police officer at judging levels of intoxication in a DUI case?

To answer this question, researchers at Rutger Universitys Alcohol Behavior Research Laboratory conducted a series of experiments. For purposes of comparison with officers, two groups of non-police witnesses were first tested. In one, 49 lay social drinkers sat in a room as various subjects were brought in one at a time for observation and questioning. Each subject had either consumed varying amounts of alcohol or had consumed nothing; each had been given tests for blood-alcohol concentration. Each in turn answered questions from the lay witnesses until all were finished, then got up and left. Each of the 49 witnesses was then asked to judge each subjects state of sobriety or intoxication. The researchers conclusion: "The assumption that social drinkers would prove to be accurate judges...was not confirmed."

In the second group, 12 bartenders were tested in the setting of a large cocktail lounge. Again, the researchers found that "the bartenders correctly rated a target in only one of four instances".

The researchers then turned to 30 experienced DUI officers from various New Jersey law enforcement agencies. Separated into two groups, the first group of 15 officers were tested under laboratory conditions similar to those in the experiment involving lay social drinkers. The second group of 15 were tested under circumstances commonly encountered in a drunk driving

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