As an experienced Massachusetts DUI lawyer, one thing is clear from having DUI trials and watching DUI trials is that police officers administer the field sobriety tests according to their own personal style and preference. The National Highway Traffic Safety Administration studied the standardized field tests, the horizontal gaze, nine step walk and turn and one leg stand.
The reliability of the horizontal gaze test is 77% accurate; the nine step 68% accurate; and the one leg stand 65% accurate. Despite the minimal reliability of these tests, these are deemed the standardized test. Officers use other tests such as a finger to nose test, counting test and alphabet test, none of which have ever been studied for reliability in detecting drunk drivers.
In a recent trial I had, the officer's testimony indicated he did not administer the test correctly. He testified that on the walk and turn, the turn can be done in any manner the suspect wishes and has no set criteria. He testified he was not aware of any requirement that the turn be a series of three smaller steps as is indicated by his training manual. In one trial I saw while in court, the officer acknowledge that he instructed the suspect to put his leg down every five second and alternate legs on the one leg stand. Not only did this officer not know the criteria for the one leg stand, but he essentially created a new test.
Frequently, officers will vary in their application of the test. For example, the nine step walk and turn requires the officer to put the suspect in the start position where one foot is in front of the other. Some officers use the start position; others do not. According to the police training manual, the tests are suppose to be given in a standardized manner with a standard set of clues to guide an officer in scoring the test.
In a recent trial I had from the Dedham District Court, the officer testified that he was not aware that the nine step walk and turn allows a suspect to have a one-half inch space between heel to toe. If a suspect is required to bang their feet together, the test administered is more difficult than set forth by the officer's training.
Other officers do not use the standardize field test, but instead use an alphabet test, counting test and finger to nose test. These tests according to the police training manual are intends as screening tests prior to requiring a suspect to get out of the car to even submit to further police investigation. Many officers use these in place of the field tests while some use them as additional tests.
If you were arrested because you failed field sobriety tests, your case is very defensible as there are numerous challenges to the accuracy of these exercises, including how they are administered, conditions the tests are performed under as well as possible medical issues that could impact the results.
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