Most of us drive cars or small trucks or motorcycles. To enjoy this privilege, we must do numerous things, some of which cost money. We need to be of a responsible age, get training and earn a license. We also must register our vehicles with their serial numbers and display license plates that identify us. Why? Because motor vehicles are inherently dangerous and a major cause of death and injury. Accordingly, certain restrictions are deemed necessary to minimize harm. The restrictions include prohibiting driving under the influence of alcohol or drugs, and enforcement of applicable laws have dramatically reduced death...