If the BPD are reading this, here is another crucial question for them: have the ligatures been tested for DNA? If yes, what did you find?There is evidence of where most of this took place.
I don't know, but I would be willing to bet on the following:
Ever notice in the pictures of the basement, it shows lots of different kinds of pipe running close to the ceiling? Here's an example showing the water heater area (which of course is going to have more):
http://www.acandyrose.com/073boiler-room.jpg
Okay, the area outside the room where JonBenet's body was later found by John is where the "wooden shards" were found. It's also where the urine stain was found. I have not seen a picture of the ceiling in that particular area, but I would be willing to bet that right above the urine stain is an overhead pipe.
How about BPD? Have they checked? (I know they are reading this.)
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I bet if the ligature showed any DNA not from a Ramsey, it would already have been made public.