What is the prescribed breath alcohol limit and under what condition is prosecution pursued?

• A. Prescribed limit is 50 mg; prosecution only if above 60 mg.
• B. Prescribed limit is 35 mg; prosecution only if above 40 mg.
• C. Prescribed limit is 45 mg; prosecution if above 50 mg.
• D. Prescribed limit is 30 mg; prosecution if above 35 mg.

Answer: (B)

The main idea here is that there is a fixed breath alcohol limit for drivers, and prosecutions are considered only when the reading clearly exceeds that limit because of the device’s margin of error. The prescribed breath alcohol limit is 35 mg. Prosecution is pursued only if the reading is above 40 mg. This gap between 35 and 40 accounts for measurement uncertainty, so a result at or below the limit isn’t charged, while a clearly higher reading (above 40) leads to a prosecution. The other numbers don’t reflect the official limit or the prosecution threshold.