coming forth to confess to that crime. we have to have a way to be able to verify and confirm when someone does come forward with information, be they a friend of brian laundrie, or anyone else, that the information is, in fact , something only known to the killer. ainsley: how did they determine strangulation? >> well, strangulation be the hyoid bone was broken and as you'll notice in the report, they talked also about a ct scan and many other tests that they performed on her and i think in part, they did that to determine whether or not she was beaten before she was murdered, so for example, with the ct scan and a black light and other things you can actually see when you're in the morgue under proper lighting you can actually see a black and blue mark before it would appear on the surface of the skin. you could see the bruising beneath the skin, with a ct scan or with black lighting. ainsley: that's interesting.