What is the breath alcohol limit in Scotland?

• A. 22 microgrammes per 100 ml of breath or 50 microgrammes per 100 ml of blood
• B. 25 microgrammes per 100 ml of breath or 60 microgrammes per 100 ml of blood
• C. 20 microgrammes per 100 ml of breath or 45 microgrammes per 100 ml of blood
• D. 28 microgrammes per 100 ml of breath or 70 microgrammes per 100 ml of blood

Answer: (A)

The key idea is remembering the exact legal limit for alcohol in breath and blood used to determine if someone is over the drink-drive limit in Scotland. Scotland sets a lower threshold than the rest of the UK: 22 microgrammes of alcohol in 100 millilitres of breath, and 50 microgrammes in 100 millilitres of blood. These two readings are treated as equivalent under the law, based on the breath-to-blood ratio used by authorities. If you test at or above these values, you’re over the limit and can be charged with drink driving. If you test below, you’re under the Scottish limit.

These figures are specific to Scotland; elsewhere in the UK the limits are higher, which is why this option matches Scotland’s official limits. Knowing the exact numbers matters because crossing them carries legal penalties and governs how roadside tests are interpreted.