195. 呼気スクリーニング検査
呼気スクリーニング検査は、呼気中のアルコールを検知し、さらに精密な検査が必要か判断する予備的な路上検査です。携帯装置へ息を吹き込み、アルコール値を所定の基準と比較します。通常、最終的な証拠測定ではなくスクリーニングに使われます。結果が基準へ達した場合、より精密な呼気分析など法的に認められた検査が続くことがあります。
What is a breath test?
A breath test is a preliminary test that detects alcohol in exhaled breath and indicates whether the alcohol level is below or above specified thresholds.
How does a breath test work?
The person blows into a portable breath-testing device, which analyses a sample of exhaled air for alcohol.
Is a breath test the same as a breath analysis?
No. A breath test is generally a screening test, while a breath analysis provides a more precise measurement of the alcohol concentration in exhaled breath.
What happens after a positive breath test?
Depending on local law, a positive result may be followed by a breath analysis, blood test or other evidential procedure.
Can police perform random breath tests?
In many countries, police may conduct roadside alcohol checks even when a driver does not show obvious signs of impairment. The exact powers vary by country.
Can you refuse a breath test?
Rules vary between countries, but refusing a legally required breath test can itself lead to penalties or an immediate restriction on driving.

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