How does an interlock device work?

Before a vehicle’s motor can be started, the driver must exhale into an ignition interlock device (IID) also known as a breath alcohol ignition interlock device (BAIID). If the driver’s blood alcohol concentration (BAC) is 0.025 percent or higher the engine will not start.

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1. What exactly does the new law require?
2. How does an interlock device work?
3. Can the interlock system be bypassed by another person breathing into the device?
4. Who will install the device?
5. What do ignition interlock devices cost and who will pay for it?