What is the primary impact of regurgitation on breath sample testing?

The primary impact of regurgitation on breath sample testing is that it causes an invalid sample. When a subject regurgitates, the saliva and other contents from the stomach can mix with the breath sample collected for analysis. This can introduce substances that are not representative of the person's actual breath alcohol concentration, leading to unreliable readings. The presence of these contaminants can interfere with the device's ability to accurately measure the alcohol level, and as a result, the entire sample may be deemed invalid for testing purposes. This emphasizes the importance of obtaining a clean and proper breath sample to ensure the test results are both valid and reliable.