There is a somewhat simple explanation for the transfer of the DNA - JonBenet was not well trained in toileting issues and had trouble wiping. She would often call out for someone to come help her.
Patsy couldn't tell exactly when JBR had last washed her hands and JonBenet had been several places that day. However, it has been said that the DNA doesn't match anyone who was at the party at the Whites' house earlier in the evening.
The DNA is supposedly from saliva or even someone's sneeze. I had a theory about it, but won't go into it too far. Among the things she was said to have *possibly* eaten that night was a plate of cracked crabs that Priscilla White had saved for her from the night before.
They had visited the Whites on Christmas Eve while out looking at Christmas lights. The Whites were having traditional cracked crab (they were from Newport Beach, CA, originally) for Christmas Eve dinner and JonBenet saw it and wanted some, so Priscilla saved it for her for the next night.
However, no one knows for sure if she actually ate it. It would have been early in the evening and her stomach contents had pretty much been digested and emptied before death - except for some fresh pineapple. I have always felt that it could've been something on the crab shells, but have always gotten ridiculed for it.
Lots of human hands had touched them and boiling doesn't destroy DNA. Her buttery hands could have retained "stuff."
that is a pretty far fetched theory if you ask me.