bought a Ford Pinto. P alleged it to be dangerously designed because
the location of the rear fuel tank was such that even in a minor rear-end
collision the tank would easily be pierced and explode. Two years later,
Ford redesigned the car, moving the tank to the front. Four years after
P bought the Pinto, her car exploded into flames after a rear-end
collision, and P was badly burned. At the trial of P's
action against Ford, P offers evidence of Ford's relocation of
the fuel tank in the later models. Ford objects. What ruling and why?