On the other hand, if you are in an accident where you are not at fault (ie normal driving and blindsided by another) then the box should help prove that.
of course, that is true.
but the issue really is not some kids going 121MPH. for a long time now, the government has been trying to do away with the concept of an "accident". everything is now someone's fault. the truth is, that some driver's brake later then others, some don't see as well as others, some don't react as fast, speed limits are set artificially low to encourage ticket enforcement, so that on any given road, almost everyone is exceeding the speed limit by 10-15%. so, should we criminalize all of these activities, and use the black box data to substantiate it?