in fact i said a few minutes ago, the bullet went from back to front, now they say it went front to back. how difficult is it to assess which direction the bullet traveled? >> this will surprise people but it can be quite challenging. if someone is shot, you know, where the gunpowder from the blast actually create -- can you see that gunpowder on someone's skin, then you obviously know that that's probably the entry point. but if you have a certain type of bullet, for example, fully jacketed bullets that aren't going to cause a lot of -- they won't do that sort of explosion effect inside, it can be difficult to say exactly what is entry, what is exit. the exit wound is sometimes a little bit bigger than the entrance wound. and also looking at the bone fragments from the skull at the entry site you'll see those bone fragments pushing toward the brain, at the exit you'll see the fragments pushing toward the outside. but despite all that, it can be challenging. i have to tell you having done