or having alcohol in your system from drinking the night before. when you fail the test, your vehicle will not start -- it's as simple as that.
you won't be able to drive again until you wait out the lock-out period. that could be as little as five minutes or as much as 24 hours. for example, if you blow and fail the test, the first failure might result in a five-minute lock out. if you fail again, you might be locked out for an hour. this continues until you are safe to drive.
there is a second test you have to take as well. it's a rolling re-test, which is given 