Joseph Scott Morgan

So as you're seeing these ridges, Nancy, you can see the composition out here is, to say the very least, is uneven.

And also this rock aggregate that's there is going to create quite a problem if you want to do a cast.

But one thing that we can draw

from the so-called ridges is the idea of a wheelbase.

This is something that we use when we're trying to assess tire tracks on motor vehicles.

Now, obviously, this is not a motor vehicle, but if you begin to think about something, say, for instance, like a wheelchair, all right, you've got two parallel lines that are running in one specific direction.

As a matter of fact, you take a look at it, it stays quite linear.

It doesn't curve.

It doesn't stay off the center here.

The idea with wheelbase, though, Nancy, is to try to assess what the distance is between the center mass of where the actual wheels are making contact in those ruts.

Let's use the term ruts because that's a term that we would normally use.

So with that information alone, you can take that and you can begin to assess what product out there would create these images or these ruts that are being left behind that can be imaged.

Can you actually say that this originated from this particular item?

Probably not, but it can at least put you in the ballpark.

Now, I have to add this one comment here.

Because of the level or lack thereof of security at the scene, we don't necessarily know what left these behind or who is more accurate.

Who left these behind?

Could it be a perpetrator that is removing Mrs. Guthrie from the home?

Or could it actually be someone like, I don't know, a crime scene person that's dragging a kit behind them?

And those ruts could actually match up with that.