Duct tape was apparently found on a skull, where do you get mouth and nose? There was no mouth and nose because of decomposition. The crime scene / swamp scene was handled so poorly that there was more than a reasonable doubt that there was even duct tape attached to the skull.
Seubert also tested three pieces of duct tape found at the scene where Caylee’s remains were recovered, two of them covering the mouth portion of her remains. She testified that aDNA profile generated on the outside of the tape matched anotherFBI forensic examiner, Lorie Gottesman.
http://www.ktla.com/news/landing/ktla-casey-anthony-jury-selection,0,6040168.story