Don is quoting this state law..
23114. (a)( )1 A vehicle may not be driven or moved on any highway unless the vehicle is so constructed, covered, or loaded as to prevent any of its contents or load other than clear water or feathers from live birds from dropping, sifting, leaking, blowing, spilling, or otherwise escaping from the vehicle.
Dumping in a STATE PARK is diffrent than dumping on the highway.. if your going to do it.. do it on the frickin freeway