happen. i have worked many cases where right after a crash, ptsd and they cause memory difficulty, they come back on occasion. >> that's interesting. how is the fbi going to figure things out? >> i have worked on cases where the shattering of windshields can be significant and the fbi can examine that particular pattern and the pattern of lines emanateing from the impact point and they can get an idea of the shape of the projectile the force with which it was coming. since it's kind of an uneven pattern, that impact is probably not a bullet. but their forensics lab is pretty good about analyzing those sorts of things and they will talk to the two other trains that happened. cluck one with an impact on the side not the front. which makes you think it was not a drop from an overpass. >> mary over the weekend, speed controls were added to this stretch of traps that has had