The hair might be one of the few tissues not affected by embalming/decomposition that could still be useful if Daniel’s body is exhumed.
This is an example I found which most closely resembles this case:
Evaluation of the addiction history of a dead woman after exhumation and sectional hair testing.http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11444668&dopt=Abstract
I can imagine Anna herself snipping a lock of Daniel’s hair for a keepsake. I’m sure if she did it was buried with J. Howard’s ashes in the urn.
If I were O'Quinn and Vergie, I'd demand that Daniel's remains be exhumed. Vergie has the right and, as Dannilynn's father, Larry also has the right on her behalf.
I think this is imperative, especially if Larry is entertaining any thought of ever allowing HKS visitation.
HKS left the hospital to purchase food. How long was he gone? Did he make a side-trip back to the house? Was any staff on duty at the house, who might remember?