So, plugging those two together, it sounds like you'd better not even, on that long drive back from SF,the law says the driver of the vehicle is the one in control of EVERYTHING to do with it.
...
NOW, suppose you are busy deep into a movie with your friends you are visiting, the gals decide to put something great together for grub, they find YOUR car (WITH handgun yet in the car, loaded) is blocking theirs,
a) get tired so have wife take a driving shift, then
b) toss your CW into the jockeybox 'cause you can't get comfortable for an hour's sleep with it in the small of your back, and finally
c) fall deeply enough asleep that you can't wake up and collect your wits before the cop gets to the driver's window.
???
MrB