1. 6- 2 Testing for Intoxication
Unit 6: Toxicology
April 22, 2015
Sanders

2. Testing Motorists for Intoxication
It is not practical nor convenient to take a blood sample of a suspected intoxicated person.
At the scene
Transporting suspect to station
Intrusive
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Unit 6: Toxicology

3. Breathalyzers Modern breath testers are not chemical.
Modern breath testers use infrared absorption devices and fuel cell detectors.
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Unit 6: Toxicology

4. Accuracy
The key to the accuracy of a breath testing device is to ensure that the unit captures the alcohol in the alveolar breath of the suspect.
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Unit 6: Toxicology

5. Breathing Many breath testers collect multiple breaths.
Breath is exposed to infrared light.
May 19, 2019
Unit 6: Toxicology

6. Analysis
The instrument measures alcohol concentration in breath by measuring the degree of the interaction of the light with alcohol in the collected sample.
May 19, 2019
Unit 6: Toxicology

7. Field Sobriety Tests
Law enforcement officers use field sobriety tests to determine a driver’s level of impairment.
Results determine whether to test further for evidential testing.
May 19, 2019
Unit 6: Toxicology

8. Horizontal-Gaze Nystagmus Test
Horizontal-gaze nystagmus test is a test of a suspect’s ability to track an object with their eyes smoothly.
An impaired person cannot pass this test.
May 19, 2019
Unit 6: Toxicology

9. Psychophysical Tests Additional tests include muscular coordination.
Walk
Run
Turn
One leg stand
May 19, 2019
Unit 6: Toxicology