6- 2 Testing for Intoxication

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Presentation transcript:

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

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 May 19, 2019 Unit 6: Toxicology

Breathalyzers Modern breath testers are not chemical. Modern breath testers use infrared absorption devices and fuel cell detectors. May 19, 2019 Unit 6: Toxicology

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. May 19, 2019 Unit 6: Toxicology

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

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

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

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

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