Interesting questions, since an interlock is already installed no one can drive the car without first blowing into it, so whoever drives the car must do that, and it may not make any difference who that is unless there is some way the devise recognizes who is blowing into it. If that is the case then you talk with the company who installed it and have it programmed for both of you.
Answered on Jul 15th, 2013 at 12:11 AM