In Illinois, at what level of cannabis THC per milliliter of whole blood does a driver become per-se impaired?
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A.
10 nanograms
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B.
1 nanogram
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C.
5 nanograms Correct
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D.
Any measurable trace
The answer is "5 nanograms"
Illinois sets the per-se THC threshold at 5 nanograms per milliliter of whole blood. The ten-nanogram figure is the trap: that number is the limit for other bodily substances such as urine, and drivers who skim past the paired numbers pair the wrong one with a blood test.
The traps in the wrong answers
A. 10 nanograms
Ten nanograms per milliliter is the limit for other bodily substances, not for whole blood. This answer reads across to the other-bodily-substance number and pairs it with a blood test.
B. 1 nanogram
The manual does not use a one-nanogram threshold; the whole-blood limit is five. This answer guesses a lower figure on the assumption that trace-level THC is a violation.
D. Any measurable trace
Any-trace applies to controlled substances, not to cannabis, which has a specific numeric threshold. This answer carries the any-trace rule for controlled drugs over to cannabis, which has its own numeric per-se limit.
This question tests your knowledge of DUI & Impaired Driving in Illinois. Source: Illinois Rules of the Road, "Blood-Alcohol Concentration (BAC)/Presence of Drugs," p.48..
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