A fragment tells you nothing about who fired it.
False. Ballistic experts Robert Frazier and Joseph Nicol both studied the two fragments recovered from the limousine, CE-567 and CE-569, and concluded that based on the marks on them, both were fired from the rifle found on the sixth floor. Both fragments had enough marks on them to link them to this rifle to the exclusion of all other rifles in the world.
Some fragments are indeed to small to match to a rifle. But that is not true of all fragments.
Question:
What ballistic expert has stated that fragments can never be linked to a particular rifle based on the marks on them.
Unless the bullet was made from some really unusual and exotic metal ..... It's nearly impossible to identify ANY manufacturing characteristic or caliber of bullet fragment...... And impossible to identify the gun that fired the tiny fragment of a bullet.
Couldn?t any rifle of the proper type fire a bullet with a certain exotic metal composition? I assume you mean a mostly intact bullet was recovered, and a fragment was also recovered and the question came up ?Did the fragment come from that bullet?. I doubt any ballistic expert would say it did, to the exclusion of all other bullets in the world.