You don't need a laser.
Here's a test even the drooling kooks should be able to perform.
Take your left hand and touch the area at the base of your neck and upper back region that corresponds with the entry wound as depicted in the autopsy photo.
Now, take your right hand and touch the area on the front of your body that you think corresponds to the area a bullet entering at a slightly descending angle would most likely exit.
Where's your right finger now, Jack ?
Probably still stuck up your kazoo.
NO NEED FOR LASERS OR 'MODIFIED' X-RAY PHOTOS