Alcohol test - breath
There are no risks.
The test does not take into account the driving abilities of the test subject. Driving abilities vary among people with the same blood-alcohol levels. Some people with blood-alcohol levels below 0.05% may not be able to safely drive. For occasional drinkers, judgement problems occur at blood-alcohol levels of just 0.02%.
The breath alcohol test helps you to know how much alcohol it takes to raise the blood-alcohol level to a dangerous level. Each person's response to alcohol varies. The test may help you make better decisions about driving after drinking.
Barnosky AR, Chapman DK, Roth VS. Occupational medicine and cccupational health in the emergency department. In: Marx J, ed. Rosen’s Emergency Medicine: Concepts and Clinical Practice. 6th ed. St. Louis, Mo: Mosby; 2006:chap 199.