Episode 48 – The Scorecard Killer
Sources for the Story Portion:
Research Topic - Field Sobriety Tests
Standardized Field Sobriety Test (SFST) is recognized in a majority of states. It’s a three part test that can correctly identify an impaired person over 90% of the time. The test is composed of three parts that are admissible as evidence in court.
1. The first test is called the horizontal gaze nystagmus. This is an involuntary jerking of the eyeball when they eyes gaze to the side. When you're sober the jerking occurs at high peripheral angles but when you are impaired it happens at lesser angles. 2. The second test is the walk and turn test. In this test the potentially intoxicated person is directed to take nine steps heel to toe along a straight line. After the 9th step they are to turn on one foot and return to the start taking 9 steps heel to toe. There are eight indicators of impairment that the officer looks for during this test and 79 percent of people who exhibit two or more of these have a BAC of 0.08 or higher. The indicators are being unable to keep balance while instructions are being given, starting before the instructions are finished, stops walking to regain balance, does not touch heel to toe, uses arms for balance, steps off line, takes an incorrect number of steps, or makes an improper turn. 3. The third test is the one leg stand test. The subject is told to stand with one foot about six inches off the ground and count out loud by ones starting at one thousand. (1,001 1,002 1,003) until they are told to put their foot down. The officer times thirty seconds and looks for four indicators. For this test 83% of people who show two or more indicators have a BAC of 0.01 or greater. The indicators are swaying while balancing, using arms to balance, hopping to maintain balance, and putting the foot down. Obviously there are legitimate reasons why some people cannot complete these tests and the officer should ask the suspect if there are any reasons why they would not be able to complete the tests as they should be completed. Any answers need to be properly documented.