
Drinking and driving is never the way to go, but no matter how much you’ve drank, if you’re pulled over, there’s a huge likelihood you’ll fail the sobriety test. Police have 7 ways to determine whether or not you get a DUI, driving under the influence.
All 7 ways are designed to ensure failure.

Field Sobriety Tests are used by police officers to determine whether or not you have been driving under the influence, DUI. Influence means anything can impair your ability to operate a motor vehicle: any drugs or alcohol. In addition to the term DUI, police also use the term DWI, driving while intoxicated.
Suspects do not “pass” or “fail” Field Sobriety tests. Police determine whether or not they’ve observed “clues” that can lead to a DUI or DWI during tests.
There are 3 tests that have been scientifically “validated” by the NHTSA (National Highway Traffic Safety Administration) that you would likely fail:
- In this test, the suspect must follow an object with the eyes, like a pen, at an approximate distance of 12 to 15 inches away.
- The HGN is based on a quirk of human biology, an involuntary twitch called Nystagmus:
- The human eye twitches involuntarily when looking sideways at an angle greater than 45°.
- People with high BAC, blood alcohol content, twitch before hitting the 45° angle.
- HGN determines eye movement reaction.

What does the officer look for during the HGN test?
- If the eyes move smoothly or twitch noticeably.
- If the eyes twitch when moving them as far to the side as possible.
- If the eyes twitch before it has passed the 45° angle.
The HGN will only be admissible if the following factors are met:
- It is administered by a police officer who has had HGN training.
- The suspect’s eyes can be seen clearly, the test is administered in a well-lit area or with a flashlight.
- No oncoming blinking lights from either a police cruiser or passing cars disrupted the test.
- Suspect was not wearing eyeglasses or was instructed to remove them.
- If police officer hold the stimulus 12 to 15 inches away.
- If police officer passes the stimulus twice past each eye.

The Walk and Turn Test has two stages:
- Stage 1:
Suspect stands heel-to-toe and arms to the side while the officer provides instructions. - Stage 2:
Suspect walks nine heel-to-toe steps forward on a real or imaginary line, pivots or turns, and walks back another nine heel-to-toe steps.
During the test, the suspect must remain with the hands to the sides. The suspect must also loudly count out each step.

What does the officer look for during the Walk and Turn?
- If there is difficulty balancing while listening to instructions.
- If the suspect starts the test before the instruction stage is complete.
- If the suspect stops while walking.
- If the suspect cannot walk heel-to-toe.
- If the suspect steps off the line.
- If the suspect uses the arms form balance.
- If the suspect turns incorrectly.
- If the suspect takes the incorrect number of steps.
The Walk and Turn test will only be admissible if the following factors are met:
Instructions were given as mandated by the NHTSA.
The test took place under safe conditions:
- Over a reasonably dry, hard, level and non-slippery surface.
- The suspect is in no danger of falling.
- There is enough room to complete the 9 heel-to-toe steps.
- If the location wasn’t safe, the suspect was moved to a more safer location where the conditions to perform the test were better.
- There is a line that the suspect can see or imagine.
- There is enough lighting, whether natural, from the surroundings or from the officer’s flashlight, so that the suspect can clearly see the officer’s face.

The One Leg Stand Test is meant to assess the suspect’s divided attention.
The suspect is required to divide his/her attention into two tasks:
Task 1: A mental task that involves following verbal instructions
Task 2: A physical task that involves balancing on one foot for 30 seconds.
Task 2 involves the following:
- The suspect must count by thousands until the officer tells him/her to stop, all while keeping both arms to the sides and looking down to the foot.
- The foot must be held off the ground 6 inches, in a stiff-leg manner and parallel with the ground.
- The officer must keep track of time until the 30 seconds are complete.

What does the officer look for during the test?
- If the suspect puts the foot down before completing the test.
- If the suspect sways while trying to maintain balance.
- If the suspect hops while trying to maintain balance.
- If the suspect utilized the arms to maintain balance.
The One Leg Stand Test will only be admissible if the following factors are met:
Instructions were given as mandated by the NHTSA
The test was administered under safe conditions:
- Over a reasonably dry, hard, level and non-slippery surface.
- The suspect was moved to a more convenient location where the conditions to perform the test were better.
- There was enough lighting, whether natural, from the surroundings or from the officer’s flashlight, so that the suspect can clearly see the officer’s face.

Other tests that have not been scientifically validated, but that you will certainly fail if it’s the officer’s will:
Reciting Specific Portions of the Alphabet
- Suspect is asked to recite all or part of the alphabet.
Counting Backwards
- Suspect is asked to count backwards from a number ending in a number other than 5 or 0 and stopping at a number ending other than 5 or 0.
- The series of numbers are usually more than 15.
Touching Thumbs to Fingers Sequentially
- Suspect is asked to touch each finger of the hand with the thumb, counting each touch (1,2,3,4 and 4,3,2,1)
The Romberg Test
- Also called the Modified-Position-of-Attention Test.
- The suspect is asked to place feet together, head back, and eyes closed for 30 seconds.
99 times out of 100 you are going to fail these tests if the officer has already decided you are guilty of a DUI or DWI.

Sources:
https://dui.drivinglaws.org/resources/dui-and-dwi/elements-a-dui-case/stopped-dui-hgn.htm
https://en.wikipedia.org/wiki/Field_sobriety_testing
https://www.summitdefense.com/dui/administering-horizontal-nystagmus-test/
https://www.summitdefense.com/dui/walk-the-line-test/
http://www.fieldsobrietytests.net/onelegstandfieldsobrietytest.html