[Rheo]

They are saying the fibers from her body fell onto the white sheet, that's why it is used, to preserve evidence from the body.

Fibers on the sheet could also have come from the ground she was on..it is a dump site.

The fibers found on her/body sheet are similiar to the ones found in DW's environment....which could have come from the same source or could not have.

The source is still unknown.

[sunshine state]

Thank you both for your replies. That helps clear up the confusion.