cars. Court orderd. I DONT drink and drive and it is a very invasive system. You need to blow and humm at set intervals to unlock the system. Then blow 10 min after driving and 1 time every hour after that. Some of these systems are equiped w/ cameras that take a pic during test. I am all for these types of systems, However they are not for everyone. They should make them more available to the general public with an insuance reduction.