A Drug Recognition Expert (DRE) will use four divided attention
psychophysical tests to evaluate someone suspected of drug impairment. These tests are standardized
in their administration, documentation, and interpretation. The next few
blogs will examine each test in detail.
This test requires the subject to stand with the feet together, the head
tilted slightly back, the eyes closed, and estimate the passage of thirty
seconds. When the subject believes that the thirty seconds have passed,
he or she it to tilt her head forward, open the eyes, and say “Stop”.
Administrative Procedures that the DRE will direct to the subject:
• The subject must stand straight with the feet together and the arms
down at the sides
• The subject must maintain that position while he gives the instructions
and tells the subject not to start the test until told to start
• He will ask the subject if he or she understands
• The DRE will instruct the subject that when they begin the test
they must tilt their head back and close their eyes. He will demonstrate
how the head should be tilted.
• He will tell the subject when to start and say “keep you head
tilted back with your eyes closed until you think that thirty seconds
have gone by”.
• The DRE will tell the subject to bring their head forward and say
“Stop” when the subject thinks thirty seconds have passed
• Ask the subject if they understand
• Start the test and tell the subject to begin the test
• Keep track of time while the subject performs the test
The DRE will be looking for the following:
- body tremors
- eyelid tremors
- muscle tone
- any unusual statements made by the subject
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Source: A training manual for the Drug Evaluation and Classification Program