Fighting Wisconsin DUI Field Sobriety Tests

There are three Standardized Field Sobriety Tests (SFST) used by Wisconsin police officers to determine impairment.  The results of the Horizontal Gaze Nystagmus (HGN) test are used to determine if you are “too” impaired to drive.  Nystagmus is the involuntary jerking of the eyes as they move side to side.  When a person has a WI Blood Alcohol Content (BAC) over the legal limit, the jerking becomes more distinct.

WI DUI Testing Your Eyes

A WI police officer looks for specific cues to determine intoxication for a suspected WI drunk driver.  These cues are lack of smooth pursuit, nystagmus at maximum deviation, and onset of nystagmus at a 45-degree angle.  A driver will be charged with a WI DUI if a police officer notices 4 of six total cues.

Fighting WI DUI HGN Observations

A WI driver may be intoxicated, but there could be many other reasons for HGN.  Because WI police officers do not administer the HGN test when a WI driver is sober, the officer has no baseline to compare the results of HGN when intoxicated.  Some people exhibit HGN when they are sober due to illness, medications prescribed by doctors, allergies, a long day at work, etc.  Even though police officers are trained to administer WI DUI sobriety tests, the tests may not be administered correctly, which affects the results.

Wisconsin DUI Attorney Certified SFST Instructor

Attorney Nathan J. Dineen of Vanden Heuvel & Dineen, S.C. is a Certified Instructor of WI Standardized Field Sobriety Tests.  Attorney Dineen trains other attorneys on the proper procedure of SFSTs.  He has the ability to train police officers.  These skills help him pinpoint flaws of the SFSTs administered to his clients.  Contact him at 1-877-384-6800 for a Free Case Review.