General Discussion

One other thing that I must mention: the term frangible bullet was introduced yesterday by Dr. Wecht, who I believe, as I understand him, feels that there is a possibility that there was a simultaneously fired or synchronized shot somewhere from the right front or right side striking the President in the area where the skull was already blown away.
Now, about frangible bullets causing such injury or causing injuries in individuals. I happen to be a coauthor of the only paper that has ever been written about the wounding capabilities of frangible bullets. Frangible bullets are bullets that are designed to be used in shooting galleries. These are bullets that are specifically designed to break up on the backdrop of the shooting gallery, so as not to ricochet and cause injury to either the shooters or to the people who work in the gallery.
Such bullets usually are formed of iron filings or small granular pieces of iron bound together by some organic substance, so that upon breaking up they break into numerous pieces. Such bullets and the breakup products of bullets are easy to detect in X-rays. There are no such fragments in the X-ray of the late President's head.
There was no frangible bullet fired.
I might also add that frangible bullets are produced in 22 caliber loads and they are not produced in larger weapons.
There is no evidence in the X-ray of the President's head of a frangible bullet shot. If there were, I would expect to see square appearing particles of which are not present and, furthermore, if such a bullet were fired into the side of the head, through the aperture caused by the exiting large bullet, I would expect those pieces of the frangible bullet to have continued over to the left of the head and there would be material, metallic material easily identifiable seen in the left side of the brain.
There are no such fragments present.