lining up the tire tracks
Great! We know these two angles should
be equal so we just do 180 minus 32…and
then divide by 2 to get 74 degrees!
Frank: Whoa. Not so quick—based on ballistics, that’s what
the angles should be, but that’s what we’re still trying to establish.
Jill: But how can we check it?
Frank: Well, it depends what angle the car was parked at,
doesn’t it? Remember, we can’t just say it “looks about right” on
Joe: But the car isn’t even marked on the sketch.
Jill: No, it isn’t. But we have the tire tracks—and the angle of
one of those. Though not the one on the side that the bullet hit.
Joe: That’s just typical! Why couldn’t they have measured the
angle of the other track?
Frank: I think it doesn’t matter which side they measured…
I’ve never seen a car where one set of tires was at a different
angle to the other side!
Jill: That’s true…so does that mean that both sets of tire marks
must be at the same angle?
38 Chapter 1