Too lazy to read all the comments, this device seems great, what could make it better is a GPS chip that would render the device inoperable if it detects movement. The device beeps, and the user has to absolutely be stationary to re-take the test.

It was the summer of 2002, I was 11, my mom was picking me up from band practice (clarinet), and I asked her if I could drive, and much to my surprise she said “Only if you don’t go above 15MPH.” So I drove home, through some back roads, a classmate was playing outside on a trampoline with some friends and I honked…