[roberttod]

I wasn't sure what an "interlock" was, and it's a breathalyzer that prevents the vehicle from starting. Was that a mistake?

Edit: ah! I think you meant engine immobilizer

[Dylan16807]

interlock. noun. an arrangement in which the operation of one part or mechanism automatically brings about or prevents the operation of another

Requiring a breath or a specific key signal are both interlocks.