Buried deep within the massive infrastructure legislation recently signed by President Joe Biden is a little-noticed “safety” measure that will take effect in five years. Marketed to Congress as a benign tool to help prevent drunk driving, the measure will mandate that automobile manufacturers build into every car what amounts to a “vehicle kill switch.”

As has become standard for legislative mandates passed by Congress, this measure is disturbingly short on details. What we do know is that the “safety” device must “passively monitor the performance of a driver of a motor vehicle to accurately identify whether that driver may be impaired.”

Everything about this mandatory measure should set off red flares.

First, use of the word “passively” suggests the system will always be on and constantly monitoring the vehicle. Secondly, the system must connect to the vehicle’s operational controls, so as to disable the vehicle either before driving or during, when impairment is detected. Thirdly, it will be an “open” system, or at least one with a backdoor, meaning authorized (or unauthorized) third-parties can remotely access the system’s data at any time.