All Posts
List of all the posts. Please see link below
Blog
Unreliability of Horizontal Gaze Nystagmus test during a DUI investigation
This article discusses the Unreliability of the Horizontal Gaze Nystagmus test during a DUI investigation. HGN: HORIZONTAL GAZE NYSTAGMUS One of the most common arrests in Los Angeles County is a DUI. If you are investigated for a DUI, the DUI investigating officer may ask you to submit to field sobriety tests. The field sobriety tests are a series of tests that are supposed to help an officer during a Los Angeles DUI investigation to determine if the driver is under the influence of alcohol. The most commonly used FST tests (and the ones approved by NHTSA) are known as “Standardized Field Sobriety” tests and are the One Leg Stand (OLS), Walk and Turn (WAT), and Horizontal Gaze Nystagmus (HGN). […]
One Leg Stand Test Unreliability During DUI Investigations
NHTSA (National Highway Traffic Safety Administration) over thirty years ago researched and determined that out of numerous filed sobriety tests used by law enforcement, the most reliable are the One Leg Stand Test, the Horizontal Gaze Nystagmus Test, and the Walk and Turn Tests. Here, I will discuss One Leg Stand Test (OLS) and its reliability (or rather unreliability), during a DUI stop in Los Angeles. NHTSA determined that 83% of people who exhibit two more “clues” during poor performance on One Leg Stand Test will have a blood alcohol content of .08% or higher. First off, that means that 17% of people who fail this test are not under the influence. But more importantly, other factors that intoxication can affect […]