How many breath samples must be taken and how is the evidential reading determined?

• A. Three samples; the median reading.
• B. Two samples in separate cycles; average reading used.
• C. One sample, the higher reading used.
• D. Two samples in the same cycle; the lower reading used.

Answer: (D)

Two breath samples must be taken in the same breath-test cycle, and the evidential reading is the lower of the two readings. This approach provides an internal check against random errors and reduces the chance that a transient factor like mouth alcohol or breath technique temporarily inflates the result, ensuring a fairer, defensible measurement for enforcement.