I'm not a con law scholar, but I think he's referring to Carroll v US and subsequent ruling, summarized on Wikipedia here: http://en.wikipedia.org/wiki/Motor_ve

I'm not a con law scholar, but I think he's referring to Carroll v US and subsequent ruling, summarized on Wikipedia here: http://en.wikipedia.org/wiki/Motor_vehicle_exception http://en.wikipedia.org/wiki/Motor_vehicle_exception .